[bug 1138854] Add event initiative in admin search filters.
[bug 1138854] Add event initiative in admin search filters.

johngian/remo,tsmrachel/remo,mozilla/remo,akatsoulas/remo,chirilo/remo,tsmrachel/remo,chirilo/remo,Mte90/remo,mozilla/remo,johngian/remo,mozilla/remo,tsmrachel/remo,abdullah2891/remo,flamingspaz/remo,abdullah2891/remo,Mte90/remo,Mte90/remo,johngian/remo,akatsoulas/remo,abdullah2891/remo,chirilo/remo,abdullah2891/remo,Mte90/remo,mozilla/remo,flamingspaz/remo,flamingspaz/remo,chirilo/remo,akatsoulas/remo,flamingspaz/remo,johngian/remo,tsmrachel/remo,akatsoulas/remo