According to https://de.wikipedia.org/wiki/Bubble_Tea (easily accessible via dropdown from the english-language wikipedia), it's sadly Denglish: „der Bubble Tea“
(but by the time it gets its own DIN maybe it'll become „der Kaugummiähnlichtapiokaperlenkondensmilchhonigeinwegeistee“?)
Given how the scene played out, there could be a giant Walpurgisnacht witch float and there could be a procession of the familiars after her. Or that who freaking circus that we see for like two seconds.
Madoka is heavily inspired by Goethe's Faust [0]! Walpurgisnacht is a (rather irrelevant) scene in the latter, iirc one episode had random quotes on the wall, and the thematic similarities are very hard to not notice.
I like the idea of mashing up Nietzsche's Abyss with Moore's Rorschach: "None of you abysses understand. I'm not stuck here gazing into you. You're stuck here gazing into me."
Lagniappe:
Radio Yerevan was asked: "Is it true that the Capitalists are standing on the edge of an abyss?"
Radio Yerevan answers: "Yes, true. And our goal: to catch up and go beyond them!"
PS. If there were a bounty, my entry would be not DE:Boba Nacht, but rather FR:Boba Fête...