Oh yes, plants do so much better if they're potted up ahead of time and watered back to perkiness. Digging them with a couple of days of the swap, or the day, makes for bedraggled offerings that some hesitate to try to resuscitate . And please make labels!! (this is said as one of the people asked to ID plants all afternoon).
I've started a list of who wants what, I will be able to fulfill all requests so far (except zebra grass which hasn't shown life yet) although for those of you getting obedient plant, it may be a paltry little pot. It spreads faster the moister its soil, and I moved it to a drier area where it had plenty of space. Ha! It hasn't spread much because it's drier.
I recommend printing and bringing a list of who gets what including a list of what other people are bringing for you. And label the plants with the person's name too if you can.
Thanks so much to those of you setting aside plants for me! I need to make a special spot for my new spearmint, it's shocking that it doesn't fight as hard as the other mints.