o0o0o finally an area I can help in!
If depends where you are having it and that is limited by your guest count.
This is a quote from an email from a wedding planner "You can do a Reception in front of Expedition Everest. The event must start 2.5 hours after park close. There is a $3000.00+ venue rental fee, a $10,000.00++ food and beverage minimum expenditure, and you MUST rent the Expedition Everest attraction as well, which is $8500.00+. Meal service for this venue is buffet only. Additionally a Disc Jockey will run around $6500.00 for the Reception.
For Harambe Village, you must have a minimum of 200 guests in order to use that location for a private event."
I remember from other emails that Belvedere is a $3,000 site fee, Tamu Tamu was $250ish and Flame Tree Gardens was $500.
I hope it helps... and that the fees haven't gone up in the past year!