“Frontier Probability Days 2021” (FPD’21) is a regional workshop, taking place at the University of Nevada, Las Vegas, Las Vegas, Nevada on May 16-18, 2021. Its purpose is to bring together mathematicians, both regionally and globally, who have an interest in probability and its applications. FPD aims to complement other regional conferences in Probability that are held annually elsewhere in the US. Graduate students and postdoctoral fellows are especially encouraged to apply.