Urie said the pop-rock group will disband at the end of its forthcoming tour as he and his wife, Sarah, prepare to welcome their first child this year.
One fan claimed the blaze started from an on-stage pyrotechnics machine.
"The highest hope we have is voting this monster out in November," the two-time Grammy nominee tweeted.
Taylor Swift and Ariana Grande are tied for the most nominations with 12 nods each, including Video of the Year.
The Panic! at the Disco frontman, who previously collaborated with Swift, called out Braun for acquiring nearly her entire music catalog.
The "Ready for It" singer had been dropping cryptic hints about her latest song and video with Brendon Urie on Instagram for weeks.
Lil Dicky’s “Earth" features Justin Bieber, Ariana Grande, Snoop Dogg, Sia, Miley Cyrus, Ed Sheeran, Wiz Khalifa, Katy Perry — and even Leonardo DiCaprio.
The singer-songwriter, who identifies as pansexual, will receive GLSEN's Inspiration Award.
"It’s just people that I am attracted to."