On his blog Jef Claes, organiser of DDDBE, shares some good tips on how to organize a meetup.

I've organized a few DDDBE meetups in the past, and always succeed in forgetting something. Either someone points it out well in advance, or I end up stressing last minute. This post partly serves as a checklist for myself, but it would be a welcome side effect to also see it encourage others to help out organizing future meetups. Organizing a meetup is not rocket science, having a list of what to take care of is a good start.

http://www.jefclaes.be/2017/02/how-to-organize-meetup.html