A 1-day license? Not sure, I thought they only issued those for cat 5 races.
It's definitely not the only 2021 race though - CBR is planning on having a number of them throughout the summer, Ontario has had one and another coming up, Rosena Ranch, Tour de Murrieta, and I think there were some others on the tentative calendar. The big issue was city permits I believe, as each city has their own interpretation of the COVID restrictions.
Some of the proposed race dates are on here, but I think not all.
https://scnca.com/proposed-dates-for-2021-season/