A fiftieth, a retirement, a league wrap-up, somebody's kid finally graduating: plenty of these end up in a booked room instead of at the house.
Two practical limits on hosting at home are parking and the bathroom. Nobody phrases the second one as a plumbing concern, but that is what it is. A house built for four people has one guest bathroom and a drain system sized for a normal Tuesday. Thirty guests across four hours will send more flushes through that one toilet than it sees in a week, and the kitchen sink will take the rinse water off catering trays, which is to say grease, at a rate the line was never asked about.
That is the actual ceiling on hosting at home, and it is better to know where yours sits before the invitations go out than at nine on the night. The failure is rarely dramatic. A toilet gets slow, then slower, then backs up while there is a queue in the hallway. A double sink gurgles in the second basin when the first one drains, which is the line telling you it is already partly closed. A camera inspection is a planning-week task rather than a party-week one, and Kingdom Plumbing, which lists sewer and drain service, is one of the valley options for that kind of look.
Venues deal with a version of this problem at a different scale. Bar drains take ice, citrus rinds and whatever comes off a hundred glasses a night, and keeping them open is a scheduled line item rather than something anyone gets to forget. That is the trade being made when thirty guests go to a venue instead. You get the room and somebody else's drain schedule.
So if the reason is genuinely the parking, book a room. If it is the bathroom, that is a solvable problem at your house as well, and it is a much better problem to look at during a quiet week than during a party. Either way, settle the head count first, because everything downstream of it gets planned backward from that number.