We have a small crew on Sunday - looks like 4-5 players - so we're going with AD&D.
I'll be running the tournament version of C2 The Ghost Tower of Inverness.
The conceit of that one is there are four condemned but mid-level characters and a loaner monk from the local monastery, and they're sent to retrieve the mysterious and powerful Soul Gem from the ruins of the Ghost Tower.
I'll be running it straight-up, using the same rules we used for S2 White Plume Mountain.
It should be fun. Hopefully the players can find their way through to defeating it, but it's a tough adventure with players with varied levels of AD&D experience. That makes it especially challenging. May they roll a lot of 20s and apply the lessons learned from WPM!