https://community.kde.org/Schedules/Plasma_5#Future_releases
5.19.90 Beta Thu 2020-09-17 (same day)
5.19.90 Beta Review Day! Thu 2020-09-24 (same day)
5.20.0 Release Tue 2020-10-13
Jonathan to do release management again including promo.
(Jonathan has a holiday booked Sep 6 to Sep 22 which overlaps Akademy and Beta release, so if that goes ahead it needs some adjustments but it probably won't go ahead).