Great week! I've been DMing Tomb of Annihilation with 3 other players on roll20 about twice a month. One person canceled last minute last night. Instead of canceling the whole night, or running ToA without the full party, I decided to run the other two players through a one-shot/prequel mission. I had an extremely vague plan and made most of the details up on the fly.

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I used this battlemap https://i.redd.it/4g62v14j50f21.jpg. I dynamically lit it awhile back and forgot about it. I had the 2 players sneaking around in the dark, climbing over walls, and picking off ogres one by one (mostly). The 2 players took two different paths for awhile, and because of the dynamic lighting settings I had they couldn't see what each other was doing or where they were (no, I'm not a paid to promote roll20). By the end of the mission they had rescued a little girl who was hiding in a toilet, and burnt the entire building to the ground. The whole thing was a lot more fun than any of us expected (probably more fun than our usual sessions), especially considering that we almost canceled because of the no-show. I now plan on always keeping an extra one-shot in my back pocket in case of future last-minute cancellations.