Set menu, decent music, big tables seat about 8-10. Kids in separate room so all adults. Last time Katy Perry came out a little bit before the countdown and did a few songs. I'm not sure about Lionel but the bigger stars do a few songs at the end and that's it, they don't sing all night lol
Invitation this time stressed dancing so I assume Lionel Ritchie more of a love song slow dancing type , not familiar with his music but mom seems to be looking forwards to it ( though she's not able to dance now so she's leaning towards Bruno Mars or Maroon 5 LOL )