That is really nice of you to host the parties. My brother in law also invites coworkers over for thanksgiving and Christmas, especially those that are away from their homes and don't have anyone to spend it with. The light event display looked interesting, but it wasn't my cup of tea.
This is nice! We are having a friend over on the 25th who will stay the night as well. After a recent divorce, it will be his first alone for a very, very long time - perhaps his first ever.
That is a very nice gesture, and I bet he really appreciates it.