Im having a Ghost party pretty soon, what are some things I can do during the party?

I already have some planned out, Luigi's mansion and Pacman competitions with prizes, then an hour and a half of ghost adventures, then during the night well look for ghosts around my house. (I already know that there are 3 spirits in my house) but I feel like I don't have enough activities. by the way, if you're just going to say "Ghosts aren't real!" as an answer, just click away now.