There's a small cafe with sandwiches and salads in a case. Eating area cannot accommodate 30. There is a restaurant there but I don't remember the name. It was a little pricey but it could probably handle 30 people. Your best bet is to contact the museum.
I didn't see where they serve food.
Sorry no idea... But I have another idea... Old fashioned CALL THEM ijs
The day that I went there was food served specifically for you an exhibit opening that will work. However I am sure that the museum can handle 30 people for an event, there seem to be a food Hall down the way but I didn't check it out
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