It's a 'taste of' event. It went live on their website for March with the description of experiencing, "...the themepark for this separately ticketed event..." and then the part of the site with the calendar "went down". I don't think this means that there are no announcements about reopening parks sooner than expected, but this was not the the sign I thought it was. I still think that themeparks will be able to open in a lower-tier/ earlier like may/june.
ETA: here's the link to it:
https://mstore.universalstudioshollywood.com/?View=taste, but it doesn't look like you can make reservations/purchase yet. Here's to hoping that RIDES can be part of our visit to DLR in red tier!!!