You can change the value "1" to "0" in this line:
UPDATE GameOptions SET "Default" = 1 WHERE Type = 'GAMEOPTION_EVENTS';
which is in Community Balance Patch\Core Files\Core Changes\CommunityPatchDLLChanges.sql
edit: for deleting base events, just delete the "events" folder
UPDATE GameOptions SET "Default" = 1 WHERE Type = 'GAMEOPTION_EVENTS';
which is in Community Balance Patch\Core Files\Core Changes\CommunityPatchDLLChanges.sql
edit: for deleting base events, just delete the "events" folder