The fan celebration takes place in Riverside, Iowa, which has put its claim on being the birthplace of James T. Kirk, though Trek lore simply says he's from Iowa. (And, as we know from recent spoilers for J.J. Abram's upcoming Star Trek movie, Kirk may not be born on Earth at all.)
The town holds an annual Trek celebration, calling itself the "future birthplace of Capt. James T. Kirk." This year marks the 25th anniversary of the family event, officials said. Money raised during the events goes to fund academic scholarships, new playground equipment and other causes.
The three actors will take part in events on June 27, including a parade, a costume contest and a question-and-answer session. Star Trek opens May 8.