Has anyone done regional wine tasting sessions IN Leipzig (not in other towns in the region or at the wineries)? Where did you do this?
Leipzig has one or two locations where you may do wine tasting seasons, but there is no specific tradition.
You got recommendations close to Leipzig already:
https://community.ricksteves.com/travel-forum/germany/wine-regions-saale-unstrut-near-dresden
Try this:
https://www.weingalerie-leipzig.de/weine-aus-deutschland/
Regional wines from the Saale-Unstrut area and Meissen area.
Other ideas are:
edelrausch
Könneritzstraße 61
(excellent wines, not so sure about the regional wines)
https://www.edelrausch.de/ueber-uns/filialen/leipzig-schleussig
and
Gourmetage
Grimmaische Straße 2-4 (Mädler-Passage)
(a fancy grocery with excellent wine selection - been there and loved it)
https://www.gourmetage.com/fachgeschaefte/leipzig-maedler-passage/