9:50 AM PT -- We've just heard from Caesars Palace -- where the show was supposed to happen -- a rep tells us, "We fully support Adele and are confident the show she unveils at The Colosseum at Caesars Palace will be extraordinary. Additionally, guest who booked hotel rooms through Caesars Entertainment’s site or customer call center at any of our properties can cancel for a full refund."
Adele says she's tried everything possible, but the show will NOT go on, as they say -- COVID has forced her to cancel her upcoming Vegas residency.
Adele apologized to fans Thursday for having to cancel at the last minute. She says she tried hard to make sure her show was ready in time, but she says it's been nearly impossible with delivery delays, and half of her team being down due to COVID-19.