My 40th has already come and gone, but I really really wanted to hold a Bob Ross party. Set up a bunch of easels, have stacks of blank canvas, palettes, brushes, paints, thinner, etc., and then put the entire Bob Ross collection on. This was before Twitch did the Bob Ross marathon and then it was made available on demand on one of the streaming services (Netflix?), so I was in before it was cool.
Obviously, booze would be involved.