Volunteers Needed for Check-In, Access Control, Registration, Hospitality and more. The Indiana University Natatorium – Indianapolis is honored to host the final stop of USA Swimming’s 2026 Tyr Pro Swim Series next month from June 17-20. Indianapolis will be welcoming approximately 600 of USA Swimming’s most elite athletes along with approximately 200 coaches, 65 officials, and fans from across the United States for four days of exciting racing in the city known for speed. America’s fastest swimmers, including most of the active 2024 Paris Olympians, are expected to compete.