Guys night in!
I've yet to have one, but I know what my 9 year old son likes to do and I assume his buddies would like it too...
I think that I would have it scheduled out... otherwise they get into trouble ..
I would have them do game night and then play the Wii or Xbox... I'd give them something to make.. Like maybe do a contest of who can make the coolest ghost head... Hide and seek... Then Pizza and a movie..
Older kids, I'm not so sure.. I know that my nieces are teens and when they have a sleep over.. they are on their phones next to each other the whole time.. lol.. I don't want that.. But my boy loves games and Minecraft..