I found this as a #federated events planning / signup app to use as an alternative to Facebook. Digging the idea and the site’s illustrations! https://joinmobilizon.org/en/
@mathias it may sound like a different service/software but #Loomio does it and more better IMHO (using your e-mail ID to log you in).
QOTO: Question Others to Teach Ourselves An inclusive, Academic Freedom, instance All cultures welcome. Hate speech and harassment strictly forbidden.