Wow!! I've spent the last few minutes searching the AAP sessions, and you've covered all the stuff I was going to suggest. Modulation pedals, attenuators, Studio One... I should probably go back and rewatch some of those. Here's one idea that may've been covered but I didn't find right off. It might be beneficial for some of the newer folks...I'm thinking this would be on the level of someone that just got BBG and is working through it and not someone that has been around the block a time or two already.
How about the basic differences in different types of guitars and pickups and what kind of sounds they stereotypically make. Singles (like Strat and Tele) vs P90s vs PAF-type humbuckers vs active humbuckers as well as Strat vs Tele vs LP vs 335 vs hollow body (big Gretsch/jazz box or a thinline like a Casino). Maybe a brief history of who played what when you talk about them. To make it more interesting to some of the older guard, maybe talk about your Fender and Suhr Strats and what makes them different or your PRS and Gibson LP and how they're different. Or maybe talk about why your 335 has Lollar Imperials in it (I think I remember you saying in another session that's what it had) instead of the usual 57 Classics - what kind of difference you hear in those.
Or, as another thought, since AAP has been going for 5+ years now, go back to some of the first couple year sessions and refresh them. "Favorite reverb and delay pedals 2023 edition" kind of thing. I know that you want to avoid repeating too much so you can be sure that everyone is getting their money's worth, but I bet most of us are enough of a gearhead that we're not going to care if you talk about the same thing twice in five years. Do another OD/delay/reverb/whatever pedal shootout. Just go back and see what pedals you did before and throw in a different pedal or two into the mix.
Another idea... Not to copy from the youtubers too much (or spend your money for you), but do an afford-a-board kind of session. Go to Amazon and find some really inexpensive pedals and work your magic to show that you can outfit a decent sounding pedalboard for around (whatever price you set). No, they're not going to sound as good as the gig board you use, but, for a beginner, they'll get them started and carry them for a good while. Plenty of recognized brands like Behringer and Joyo and Donner have some good sounding pedals in the $30-$40 range. If you go with some of the Chinese copies you can sometimes get them for $20-$25. Or, if you want to throw used in the mix, hit Reverb and see what you can get there. I've had pretty good luck buying brands like NuX and even EHX on the cheap there (although sometimes you kind of have to wait on the deals). BONUS: Since they're cheap pedals and not something that you'd probably use on the regular, after the session, raffle it off to an AAP member (or at BGU Live 2024) and give the proceeds to Guitars for Vets or the Texas Music Project or some other musically-inclined charity.