Hello David,
So you found the forum... Welcome!
I hope the weather improves too... Anyhow, I am available to play badminton too, I used to play that as a kid, I would probably need some time to get the hang of it again.
In the Livers & Lovers there was someone actively collecting phone numbers to play beach volleyball. Unfortunately I don't recall right now who it was, and I don't have the list either

Something we may want to keep in mind too for the future, there are outdoor soccer and volleyball facilities south of the Tierpark crossing the river.
Cheers,
Carlos