Obama had an inauguration luncheon in thed capitol after the swearing in and speeches, followed the parade. Don’t see this on schedule for Mr. Trump.
Bush also had a luncheon in the Capitol between the swearing in and the parade. As you pointed out, it’s not listed on the schedule, but I would think they would have something. Also, there was a coffee at the WH before the swearing in - I think it was from Clinton to Bush. Didn’t watch any of Obummmer’s so don’t know if there was a coffee from Bush to O but Bush was very gracious during the transition, so it wouldn’t surprise me if there was one.