The best thing I learned personally, was to "lean into" the craziness. What does that mean? It's probably best explained via the actual scene we did during the workshop.
So a scene started with 2 brothers throwing change into a pond, both wishing for good luck with their SAT exams. Eventually after "tens of dollars" was put into the pond a genie appeared. After some initial reaction to the genie, a cop eventually came in and did the usual "what are you kids doing in here!?" thing. At this point John stopped the scene and said that the cop move really lowered the fun and energy of the scene, since it went from kids to genie to cop. In other words, it went from reality to fantasy, back to reality.
Instead, John suggested that once something as crazy as a genie appears, you've got to keep it going for the energy of the show. He suggested we have witch come out or a leprechaun, and they also can grant wishes and maybe they have tension with genies. In other words, once something as crazy as a genie comes out, it basically shifts the entire base reality up to a world where now genies can exist. So if you bring in a cop, it kind of "down shifts" the base reality down to a less "heightened" world. This basically is a buzzkill to a show's energy.
The better approach is if we're now in a world where genies can exist, then other fantastical things must now exist and now they are "normal" characters. I specifically say that they are "normal" because they can still be grounded characters, even though they are fantasy characters. So when we eventually did this, we found out that the witches think that all genies are swindlers, and genies think witches are back stabbers, and we had this big mapping game of racism on fantasy characters. At this point, the monoscene can continue, but now we have this shifted reality. Otherwise, you do the same stuff: you find games/relationships/characters just as you would with a normal monoscene, but instead of normal humans, you have these grounded fantasy characters that can do all of the same stuff normal people do.
My overall lesson was this concept of a "shifted base reality" and that even though we're playing fantasy characters, they can still be grounded and have fun games. I think this approach is really useful for a monoscene because you can't just swipe a scene after a crazy character pops in, you have to learn how to play with the crazy over a 25 minute show. I just have to remember that even though I am playing a freakn' mythical genie, I can still be a grounded character where I can still be annoyed, have an overbearing mother, become sad, or angry. Me being a genie is just an external label, as I can still have all of the same normal human traits I am so used to playing.