Very good account - thank you. Sounds like you learned a lot about what to do and not to do.
My rule of thumb: Don't take a full head-opening dose of anything anyplace you're not comfortable getting naked and fetal for some hours. It may not happen most trips - but ANYTHING can happen on a full dose of psychedelics regardless of how experienced the tripper. So if it's not a place I would feel safe completely melting into the ground I keep the dose low. If you want to take more than 250mcg of L at once at an event make sure it is a very trip-friendly, safe event.