I'd want to go to an event if I was sure it was going to have an option to be like "I am Asexual. Plz do not grope me. I do not want to be your mommy." XD
That's why I'm scared to actually meet people IRL. I never know how they're going to be. I get enough harassment about being asexual at work from well-meaning people who think I MUST be sad and lonely. I'm just like "NOoooo. I am happy and calm. I have my pets. I am pleased."
In the US you’ve got CapCon and TeddyCon to mention a few. Google is your friend. Sometimes people organize get togethers.
I know in the UK , there are some active age players in Scotland that have parties.
In the Netherlands we have two active organizations, one in the Hague and one in Amsterdam that organize things. The Hague is boring in that its only in one small room in a café. Amsterdam is held in a club and the motor behind it is a diaper shop that hires a hostes to keep things going.
As far as I know, all these events are frequented by women that do not suffer from men asking you to be their mommy.
Look for ageplay on tumblr or other social media. In the ageplay community. Its where the concept adult baby has moved to.