A.K.
If all the moms are married.....How about going to one mom's house and everybody bring an appetizer. Also, have everyone bring their wedding albums to share. The host could make a 'wedding cake'. Then have a 'round table' discussion about everyone's wedding day. "What was the worst thing that happened? What was your favorite part of the big day? etc."
You guys could also do desserts and board games at someone's house. We did that and it was a ton of fun!
Visit Dream Dinners together. Take a cooking class together. Have a dinner party ....the host makes the entree, and everyone else brings the salad, sides, dessert, but have it themed like an Italian Meal. Go ice skating. Go to Fort Rapids (indoor water park) together. Take a yoga class together. Bowling.
Have fun!