Life pro-tip,
Overbook your sessions, and play at fixed date. Someone is missing ? Their PC is busy with other duties or accept to make an_immersion concession on character suddenly not here_ when not possible to find a plausible explanation.
It solves a lot of the scheduling problems
It was huge in the 90’s with the everything you need in one book, while AD&D collections of book were too expensive for the broke kids we were.
I believe they’re know at the 4th edition, and unfortunately switched to multiple books like many others publishers