Event tent rent?

[Disneyphile]

And, don't forget event insurance costs too. If it's a private venue like someone's backyard, or a public venue like a park, you usually have to carry some form of liability insurance for the event, which some policies make you hire official security too.

From what I compared a couple years ago, it's really not any cheaper than going with a regular event venue, and in fact, some event venues are less.