They are open. We have gone to eat for dine-in a couple of times in the last couple of weeks.

I really don 't know, I was a guest as well. Best thing to do is to call the restaurant.

Yes

There is no cost to rent the hall but there is a minimum spend you have to reach to secure the room.

Not sure but it is usually pretty busy

Bands on Sat, not necessarily mariachi.

Yes