Hello, since The Lost & Found Cacher badge was canceled and Community Celebration Events don't have their own badge (only addon for Geocacher badge), I suggest to count Community Celebration Events together with Event Caches.
This is currect event situation:
Event Cache -> Social Cacher
Cache In Trash Out Event -> Enviromental Cacher
Mega-Event Cache -> MEGA Social Cacher
Community Celebration Event -> nothing
Giga-Event Cache -> GIGA Social Cacher
There are two options:
1) Count Event Caches together with CCE. For example: 160 Event Caches + 20 CCE = 180 = Diamond Social Cacher.
2) Create new badge only for Community Celebration Events.