Sunday best being clothes you would normally wear to church. No one has to wear a full suit or prom dress, but maybe a nice button up or top.
No. 10:00 to 11:00 is when the cleaning up will happen, you are welcome to leave, pitch in, do whatever you please. Our exit will be at 10:00, or earlier. If you need to or want to leave, all will be ok do what you need to do.