According to this tweet Main event is to be rescheduled for a later date. Rumor is Burns tested Positive for COVID-19 which is very possible since he had a lot of outside exposure with back to back fights and his training partner also tested positive as well.
With this, below is the UFC-251 structure now.
Alexander Volkanovski (-210 favorite)vs Max Holloway (170 underdog)
Petr Yan (-240 favorite) vs Jose Aldo (205 underdog)
Jessica Andrade (145 underdog) vs Rose Namajunas (-170 favorite)
Amanda Ribas (-450 favorite) vs Paige VanZant (350 underdog)
