Victory Fund's annual DC conference began Thursday
First lady spoke at annual gathering in Arlington, Va.
Congressional Republicans are trying to roll back progress, the president said.
Group's national dinner taking place in DC on Saturday
First lady will also deliver remarks
Funding deadline is Oct. 1.
Study spotlights impacts of Florida Gov. DeSantis's anti-LGBTQ policies
Long wait times, calls going unanswered plaguing critical LGBTQ youth resource