H.
Hi A., I am not sure if you have found any MOM's groups or not. I have twins and belong to the Annapolis Multiples group...they organize playdates I think every other week, have support groups, organize parties and activities..really awesome. Have you ever heard of Mom's Club of Odenton ? They include Severn.. here is the link http://www.momsclubofodenton.com/.
I think this is what you might be looking for. I met a few girls from this club at a Parks & Rec class...they really liked it. Hope this helps.