Thirty households, one Saturday
Street groups are brilliant at yeses. Somebody floats a July barbecue, half the cul-de-sac replies within the hour, and by the weekend the date is settled and the numbers still are not. A party on your own road runs on trust and folding chairs, but the grill still needs a rough count, and that count has to come from somewhere more reliable than who-looked-like-they-waved.
A plain invitation page handles this without turning the street into an event production. The details go on one link, neighbours reply on it, and the list of yeses fills itself while everyone keeps using the chat for the things a chat is good at: the road plan, the side dishes, whose drive needs clearing.