Is there a hall on the premises that an event can take place at

There is also a large cafeteria

It is not huge except outside. It would not be there 'norm' so do call and ask.

I was at their Moon Over Morikami event, but that was quite a fancy event that they put on. So they do have the capability to do it. You will have to ask them if they are willing to do one.

That's correct. They have a teather that can be rent

They have a theater that you can rent out for an event