I wouldn’t say our guild is small (medium?), but our core is definitely close knit. We are a Horde adult guild in Area 52 that raids 2 nights a week (Weds/Thrs). We have achieved AotC every tier since we started raiding. We have no intentions of doing mythic raiding, but we do love running M+s. None of the events are mandatory!
Here is our post for you to check out if this so far sounds good to you. Best of luck in your search!