Yes. Guests can give to a party up until midnight the day after the party. For example, if your friend had a party on May 5th and it ended at 4pm, you could still donate to that party until May 6th at 11:59 PM.
Just like cinderella, the party is over at midnight. We do not take anymore donations after that, becasue we want to begin transfering funds ,which can take 5-7 business days. We want kids to get their gift cards and charities to get their checks ASAP!