The Drum Corps International 2020 tour schedule was released on November 20, 2019, before 2:30pm ET.

The 2020 finals were officially announced and tickets went on sale before August 29, 2019. I think it was between the 20th - 25th, but perhaps earlier. The Allentown show was announced and tickets went on sale on or just before October 29, 2019. Then the rest of the tour was announced as above.

2019 Blu-ray on sale: no(seq: 140; current / past year's sales)
GETs
140Sat, 14 Dec 2019 03:00:01 -0500239,3705https971clibr
139Thu, 12 Dec 2019 03:00:02 -0500239,3705https443clibr
138Tue, 10 Dec 2019 03:00:02 -0500239,3695https1536clibr
137Sat, 07 Dec 2019 03:00:01 -0500239,3415https1427clibr
136Thu, 05 Dec 2019 03:00:01 -0500239,3415https1910clibr
135Tue, 03 Dec 2019 03:00:01 -0500239,3415https839clibr
134Sat, 30 Nov 2019 03:00:02 -0500239,3415https952clibr
133Thu, 28 Nov 2019 03:00:01 -0500239,3415https788clibr
132Tue, 26 Nov 2019 06:34:07 -0500239,3735https151clibr
131Tue, 26 Nov 2019 06:33:45 -0500239,3735https152clibr