diff --git a/libraries/chain/db_bet.cpp b/libraries/chain/db_bet.cpp
index c9d65f8c..c9670b07 100644
--- a/libraries/chain/db_bet.cpp
+++ b/libraries/chain/db_bet.cpp
@@ -2,6 +2,7 @@
 #include <graphene/chain/account_object.hpp>
 #include <graphene/chain/asset_object.hpp>
 #include <graphene/chain/betting_market_object.hpp>
+#include <graphene/chain/event_object.hpp>
 
 namespace graphene { namespace chain {
 
@@ -32,6 +33,26 @@ void database::cancel_all_unmatched_bets_on_betting_market(const betting_market_
    }
 }
 
+void database::cancel_all_betting_markets_for_event(const event_object& event_obj)
+{
+   //for each betting market group of event
+   auto& betting_market_group_index = get_index_type<betting_market_group_object_index>().indices().get<by_event_id>();
+   auto betting_market_group_itr =  betting_market_group_index.lower_bound(event_obj.id);
+   while (betting_market_group_itr != betting_market_group_index.end() &&
+          betting_market_group_itr->event_id == event_obj.id)
+   {
+      //for each betting market in the betting market group
+      auto& betting_market_index = get_index_type<betting_market_object_index>().indices().get<by_betting_market_group_id>();
+      auto betting_market_itr = betting_market_index.lower_bound(betting_market_group_itr->id);
+      while (betting_market_itr != betting_market_index.end() &&
+             betting_market_itr->group_id == betting_market_group_itr->id)
+      {
+         resolve_betting_market(*betting_market_itr, betting_market_resolution_type::cancel);
+         ++betting_market_itr;
+      }
+   }
+}
+
 void database::resolve_betting_market(const betting_market_object& betting_market, 
                                       betting_market_resolution_type resolution)
 {
diff --git a/libraries/chain/event_evaluator.cpp b/libraries/chain/event_evaluator.cpp
index 59aa5d64..7c2034b4 100644
--- a/libraries/chain/event_evaluator.cpp
+++ b/libraries/chain/event_evaluator.cpp
@@ -108,7 +108,10 @@ void_result event_update_status_evaluator::do_evaluate(const event_update_status
 void_result event_update_status_evaluator::do_apply(const event_update_status_operation& op)
 { try {
    database& d = db();
-   //TODO: cancel_all_betting_markets_for_event() //should we put this in event or just here in evaluator?
+   //if event is canceled, first cancel all associated betting markets
+   if (op.status == event_status::canceled)
+      d.cancel_all_betting_markets_for_event(*_event_to_update);
+   //update event
    d.modify( *_event_to_update, [&]( event_object& event_obj) {
       event_obj.scores = op.scores;
       event_obj.status = op.status;
diff --git a/libraries/chain/include/graphene/chain/database.hpp b/libraries/chain/include/graphene/chain/database.hpp
index e1f4ae43..91907c4a 100644
--- a/libraries/chain/include/graphene/chain/database.hpp
+++ b/libraries/chain/include/graphene/chain/database.hpp
@@ -366,6 +366,7 @@ namespace graphene { namespace chain {
          /// @{ @group Betting Market Helpers
          void cancel_bet(const bet_object& bet, bool create_virtual_op = true);
          void cancel_all_unmatched_bets_on_betting_market(const betting_market_object& betting_market);
+         void cancel_all_betting_markets_for_event(const event_object&);
          void resolve_betting_market(const betting_market_object& betting_market, 
                                      betting_market_resolution_type resolution);
          /**