This is some feedback from my experiences on Towel Day:
I had a funny, yet a bit lonesome, Towel Day! After waiting for a while finally i got a passer-by into the Pit and send him "Dont panic!" we had some fun together but he finally panicked nevertheless XD
Then it became quiet again and i took a break from hosting (was around noon time) and came back in the evening hours. I encountered more guests, but they were somewhat more serious, and not in for some joking. What ya gonna do?
I also encountered a Dragonling, but to my very misery, he's not interested in anything beyond actually playing DaS.