Arkansas has one every year on 4/13! they keep it pretty low-key and announce the location a couple weeks before the actual meet up on a facebook group, but they do happen!! very fun all around!!
I had a homestuck-themed birthday one year where everyone cosplayed and that was SUUUPER fun as well!!
if ur looking to find a meet-up in your area, id say to scour local facebook groups centered around cosplay or get into contact with homestucks at cons (they typically stay connected through like discord, instagram, etc.) these groups might be small but im certain they exist - a lot of homestuck cosplayers have just retreated underground.
I wish u luck!!!