My venue told me that we can keep the ballroom till as late as we want (with an additional fee). Our ceremony will start at 5. We are planning on having a live band, open bar, and a "midnight snack". We're planning on having about 200 guests. What time would you consider ending the reception, in an ideal world. I think 12:30 would be good for our young crowd. I don't expect the older people to stay much past 10.