Seems similar to Big Brew Day that is put on by the AHA but doesn't necessarily have to involve brewing itself, some ideas they suggest are:
– Set up a wort giveaway with your local brewery
– Have a brewing open house with members of your local homebrew club at your local brewery or even in your garage
– Book a campsite and have a brewing weekend with friends (make sure you get all the proper licenses!)
– Set up a panel with local homebrewers who have gone pro on their stories
– Collaborate with your local homebrew supply store and do a brewing demo
– Invite a local ingredient/ brewing technique expert to talk about their expertise
All ideas sound pretty cool, a wort giveway sounds interesting but there might not be enough time to coordinate. I would normally be open to hosting a club brewday at my place but child #3 is expected then and I'll be on high alert

Anyone with other ideas or thoughts let er rip, just thought it might be a nice way to get some folks together besides the monthly meetings!