For a party that size, including wristbands, I believe we spent about $900. We had several types of petite desserts, coffee, tea and hot chocolate. This was the UK terrace - before the split it to upper and lower.
For a party for about 20 people, no wristbands, we did several types of petite desserts, a fresh fruit plate, same drinks and spent about $450. That was through group dining as it was not for a wedding event, just a family reunion party.