MultiGP is the main FPV drone racing organization in the US with over 600 chapters nationwide. Go to multigp.com, click Find a Chapter, and enter your zip code. Most chapters hold free practice days and low-stakes races specifically for newer pilots -- they're genuinely welcoming to beginners.
Beyond MultiGP: search Facebook for "[your city] FPV" or "[your state] drone racing", check r/fpv on Reddit for your region, and look for Discord servers -- most regional FPV communities run Discord servers where events get announced.
What to expect at your first race: show up and watch a full race day before signing up to compete. Most chapters have an open practice session before racing starts. Introduce yourself, ask to do a practice lap, and expect to be lapped by experienced pilots -- that's completely normal. The FPV racing community is one of the more welcoming motorsport communities once you show up in person.
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