EMM VS After Hours

After all that I am reading - do EMM and After Hours events happen around the same time of year, or is the After Hours typically Jan-March and then EMM ramps up in the spring?
I would love to do either with a trip possibly in Feb over President’s Day or Spring Break. Sounds like none of these really happen around holidays.
I won’t plan my trip around it but it’s be great if I could. LOL