diff --git a/libraries/app/impacted.cpp b/libraries/app/impacted.cpp
index a5543cc1..10d17fcb 100644
--- a/libraries/app/impacted.cpp
+++ b/libraries/app/impacted.cpp
@@ -216,6 +216,7 @@ struct get_impacted_account_visitor
    void operator()( const betting_market_group_create_operation& op ) {}
    void operator()( const betting_market_create_operation& op ) {}
    void operator()( const betting_market_group_resolve_operation& op ) {}
+   void operator()( const betting_market_group_freeze_operation& op ) {}
    void operator()( const bet_place_operation& op )
    {
       _impacted.insert( op.bettor_id );
diff --git a/libraries/chain/betting_market_evaluator.cpp b/libraries/chain/betting_market_evaluator.cpp
index f5a9f778..8823e160 100644
--- a/libraries/chain/betting_market_evaluator.cpp
+++ b/libraries/chain/betting_market_evaluator.cpp
@@ -84,6 +84,7 @@ object_id_type betting_market_group_create_evaluator::do_apply(const betting_mar
          betting_market_group_obj.event_id = event_id;
          betting_market_group_obj.rules_id = rules_id;
          betting_market_group_obj.description = op.description;
+         betting_market_group_obj.frozen = false;
      });
    return new_betting_market_group.id;
 } FC_CAPTURE_AND_RETHROW( (op) ) }
@@ -129,6 +130,8 @@ void_result bet_place_evaluator::do_evaluate(const bet_place_operation& op)
    FC_ASSERT( op.amount_to_bet.asset_id == _betting_market->asset_id,
               "Asset type bet does not match the market's asset type" );
 
+   FC_ASSERT( !_betting_market_group->frozen, "Unable to place bets while the market is frozen" );
+
    _asset = &_betting_market->asset_id(d);
    FC_ASSERT( is_authorized_asset( d, *fee_paying_account, *_asset ) );
 
@@ -232,5 +235,21 @@ void_result betting_market_group_resolve_evaluator::do_apply(const betting_marke
    return void_result();
 } FC_CAPTURE_AND_RETHROW( (op) ) }
 
+void_result betting_market_group_freeze_evaluator::do_evaluate(const betting_market_group_freeze_operation& op)
+{ try {
+   const database& d = db();
+   _betting_market_group = &op.betting_market_group_id(d);
+   FC_ASSERT(_betting_market_group->frozen != op.freeze, "Freeze operation would not change the state of the betting market group");
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void_result betting_market_group_freeze_evaluator::do_apply(const betting_market_group_freeze_operation& op)
+{ try {
+   db().modify(*_betting_market_group, [&]( betting_market_group_object& betting_market_group_obj ) {
+       betting_market_group_obj.frozen = op.freeze;
+   });
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
 
 } } // graphene::chain
diff --git a/libraries/chain/db_notify.cpp b/libraries/chain/db_notify.cpp
index 9c2f1ee7..5cdbbf25 100644
--- a/libraries/chain/db_notify.cpp
+++ b/libraries/chain/db_notify.cpp
@@ -199,6 +199,7 @@ struct get_impacted_account_visitor
    void operator()(const betting_market_create_operation&){}
    void operator()(const bet_place_operation&){}
    void operator()(const betting_market_group_resolve_operation&){}
+   void operator()(const betting_market_group_freeze_operation&){}
    void operator()(const betting_market_group_resolved_operation &){}
    void operator()(const bet_matched_operation &){}
    void operator()(const bet_cancel_operation&){}
diff --git a/libraries/chain/include/graphene/chain/betting_market_evaluator.hpp b/libraries/chain/include/graphene/chain/betting_market_evaluator.hpp
index 3b4ae42e..d4020e88 100644
--- a/libraries/chain/include/graphene/chain/betting_market_evaluator.hpp
+++ b/libraries/chain/include/graphene/chain/betting_market_evaluator.hpp
@@ -97,5 +97,14 @@ namespace graphene { namespace chain {
          const betting_market_group_object* _betting_market_group;
    };
 
+   class betting_market_group_freeze_evaluator : public evaluator<betting_market_group_freeze_evaluator>
+   {
+      public:
+         typedef betting_market_group_freeze_operation operation_type;
 
+         void_result do_evaluate( const betting_market_group_freeze_operation& o );
+         void_result do_apply( const betting_market_group_freeze_operation& o );
+      private:
+         const betting_market_group_object* _betting_market_group;
+   };
 } } // graphene::chain
diff --git a/libraries/chain/include/graphene/chain/betting_market_object.hpp b/libraries/chain/include/graphene/chain/betting_market_object.hpp
index f1e13661..71c3cd34 100644
--- a/libraries/chain/include/graphene/chain/betting_market_object.hpp
+++ b/libraries/chain/include/graphene/chain/betting_market_object.hpp
@@ -59,6 +59,8 @@ class betting_market_group_object : public graphene::db::abstract_object< bettin
       event_id_type event_id;
 
       betting_market_rules_id_type rules_id;
+
+      bool frozen;
 };
 
 class betting_market_object : public graphene::db::abstract_object< betting_market_object >
@@ -425,7 +427,7 @@ typedef generic_index<betting_market_position_object, betting_market_position_mu
 } } // graphene::chain
 
 FC_REFLECT_DERIVED( graphene::chain::betting_market_rules_object, (graphene::db::object), (name)(description) )
-FC_REFLECT_DERIVED( graphene::chain::betting_market_group_object, (graphene::db::object), (event_id)(description) )
+FC_REFLECT_DERIVED( graphene::chain::betting_market_group_object, (graphene::db::object), (description)(event_id)(rules_id)(frozen) )
 FC_REFLECT_DERIVED( graphene::chain::betting_market_object, (graphene::db::object), (group_id)(description)(payout_condition)(asset_id) )
 FC_REFLECT_DERIVED( graphene::chain::bet_object, (graphene::db::object), (bettor_id)(betting_market_id)(amount_to_bet)(backer_multiplier)(amount_reserved_for_fees)(back_or_lay) )
 
diff --git a/libraries/chain/include/graphene/chain/protocol/betting_market.hpp b/libraries/chain/include/graphene/chain/protocol/betting_market.hpp
index 6d26c056..75c6cb7b 100644
--- a/libraries/chain/include/graphene/chain/protocol/betting_market.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/betting_market.hpp
@@ -137,17 +137,16 @@ struct betting_market_group_resolved_operation : public base_operation
 
    betting_market_group_resolved_operation() {}
    betting_market_group_resolved_operation(account_id_type bettor_id,
-                                     betting_market_group_id_type betting_market_group_id,
-                                     const std::map<betting_market_id_type, betting_market_resolution_type>& resolutions,
-                                     std::vector<asset> winnings,
-                                     std::vector<asset> fees_paid) :
+                                           betting_market_group_id_type betting_market_group_id,
+                                           const std::map<betting_market_id_type, betting_market_resolution_type>& resolutions,
+                                           std::vector<asset> winnings,
+                                           std::vector<asset> fees_paid) :
       bettor_id(bettor_id),
       betting_market_group_id(betting_market_group_id),
       resolutions(resolutions),
       winnings(winnings),
       fees_paid(fees_paid)
    {
-       // TODO ?
    }
 
    account_id_type fee_payer()const { return bettor_id; }
@@ -156,6 +155,20 @@ struct betting_market_group_resolved_operation : public base_operation
    share_type      calculate_fee(const fee_parameters_type& k)const { return 0; }
 };
 
+struct betting_market_group_freeze_operation : public base_operation
+{
+   struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+   asset             fee;
+
+   betting_market_group_id_type betting_market_group_id;
+   bool freeze; // the new state of the betting market
+
+   extensions_type   extensions;
+
+   account_id_type fee_payer()const { return GRAPHENE_WITNESS_ACCOUNT; }
+   void            validate()const;
+};
+
 enum class bet_type { back, lay };
 
 struct bet_place_operation : public base_operation
@@ -299,6 +312,10 @@ FC_REFLECT( graphene::chain::betting_market_group_resolved_operation::fee_parame
 FC_REFLECT( graphene::chain::betting_market_group_resolved_operation,
             (bettor_id)(betting_market_group_id)(resolutions)(winnings)(fees_paid)(fee) )
 
+FC_REFLECT( graphene::chain::betting_market_group_freeze_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::betting_market_group_freeze_operation,
+            (fee)(betting_market_group_id)(freeze)(extensions) )
+
 FC_REFLECT_ENUM( graphene::chain::bet_type, (back)(lay) )
 FC_REFLECT( graphene::chain::bet_place_operation::fee_parameters_type, (fee) )
 FC_REFLECT( graphene::chain::bet_place_operation, 
diff --git a/libraries/chain/include/graphene/chain/protocol/event.hpp b/libraries/chain/include/graphene/chain/protocol/event.hpp
index f736eefc..cf809f33 100644
--- a/libraries/chain/include/graphene/chain/protocol/event.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/event.hpp
@@ -62,6 +62,7 @@ enum class event_status
 {
    upcoming,
    in_progress,
+   frozen,
    completed,
    canceled,
    STATUS_COUNT
@@ -105,7 +106,7 @@ struct event_update_status_operation : public base_operation
 FC_REFLECT( graphene::chain::event_create_operation::fee_parameters_type, (fee) )
 FC_REFLECT( graphene::chain::event_create_operation, 
             (fee)(name)(season)(start_time)(event_group_id)(extensions) )
-FC_REFLECT_ENUM( graphene::chain::event_status, (upcoming)(in_progress)(completed)(canceled)(STATUS_COUNT) )
+FC_REFLECT_ENUM( graphene::chain::event_status, (upcoming)(in_progress)(frozen)(completed)(canceled)(STATUS_COUNT) )
 FC_REFLECT( graphene::chain::event_update_status_operation::fee_parameters_type, (fee) )
 FC_REFLECT( graphene::chain::event_update_status_operation, 
             (fee)(event_id)(status)(scores)(extensions) )
diff --git a/libraries/chain/include/graphene/chain/protocol/operations.hpp b/libraries/chain/include/graphene/chain/protocol/operations.hpp
index b26fbcf3..7d9ccc2a 100644
--- a/libraries/chain/include/graphene/chain/protocol/operations.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/operations.hpp
@@ -107,6 +107,7 @@ namespace graphene { namespace chain {
             bet_place_operation,
             betting_market_group_resolve_operation,
             betting_market_group_resolved_operation, // VIRTUAL
+            betting_market_group_freeze_operation,
             bet_matched_operation, // VIRTUAL
             bet_cancel_operation,
             bet_canceled_operation // VIRTUAL
diff --git a/libraries/chain/protocol/betting_market.cpp b/libraries/chain/protocol/betting_market.cpp
index 70a44acd..ce85ab30 100644
--- a/libraries/chain/protocol/betting_market.cpp
+++ b/libraries/chain/protocol/betting_market.cpp
@@ -42,7 +42,12 @@ void betting_market_create_operation::validate() const
 
 void betting_market_group_resolve_operation::validate() const
 {
-   //FC_ASSERT( fee.amount >= 0 );
+   FC_ASSERT( fee.amount >= 0 );
+}
+
+void betting_market_group_freeze_operation::validate() const
+{
+   FC_ASSERT( fee.amount >= 0 );
 }
 
 void bet_place_operation::validate() const