Only a Death-Eater uses absolutes.

• Gandalf or some shit

I’ve been doing this for a while, so I’ve got old modules saved in my head. I also know generally what is required to run a successful one. What I would personally do is say “Yeah, sure. But I’ll need a bit to get ready. Give me 30 minutes.” I would then use a tool like 5etools to whip up a bunch of pre-generated characters and hand them out. If I had my printer handy, I’d print them. Then I’d run them through something like the Delian Tomb that Matthew Colville made (https://youtu.be/zTD2RZz6mlo?list=PLlUk42GiU2guNzWBzxn7hs8MaV7ELLCP_), a simple orc or bandit raid on a town, or whatever else I thought was cool in the moment.

I hope that helps. I’ve been DMing for over ten years now and playing for almost twenty, so Idk how well my technique would work for you.