Our wedding was on a Sunday, rehearsal was on Thursday. My OOTs were mainly my family. A few OOTs were invited to the rehearsal dinner only because they were here early for other things (it was only 2 guests). However, I did
plan a no-host dinner the Saturday night before to spend with all of our OOTs and we had a blast. It worked out perfect. We even ended up with extra cash from it! Don't ask me how but after everybody put in what they thought they
owed there was about $70 too much. :) No one would take any money back. DH and I were happy.
The morning after the wedding we hosted a brunch in one of the suites at the hotel. They went well too.
Also, my mom went to a wedding as an OOT and was not invited to the rehearsal dinner but they did all meet up at a bar afterward. She liked that idea and was not offended at all.