After playing my one sitting for my Second Knockouts, after refreshing the game, I encountered a breaking bug that prevented me from further progress in this round. I have created a video footage of that glitch.
Notice the time is 21:33:39 EDT (my location is currently Canada, no VPN used and I have disabled my VPN). Notice the All Stars widget is at a dash suggesting that it is offline, but clearly I am online and the other widgets are working according to the video footage and the following screenshots. If you click on the All Stars widget or entry in the Events tab, it doesn't respond.
I also completed another 15 levels to make progress on a Chocolate Box. Even then, it does not wake up the All Stars event.
Have anyone else encountered this glitch?