I am unable to generate a description for a race named "BASR INVITATION PORTAL" occurring in Fairfield, OH, on June 18, 2026, with the specified distances. My search for this specific race name and location did not yield any relevant results for a running event. The provided website, https://www.brokenarrowskyrace.com/, is associated with the Broken Arrow Skyrace, which is a different event typically held in Squaw Valley, CA, and does not align with the given race information for Fairfield, OH.

The search results for "Fairfield, OH" did identify a "Cincinnati Race for Global Water 5K Run/Walk" and a "5K for TEN FE run/walk" as local running events, but these do not match the "BASR INVITATION PORTAL" name or the listed distances of 46K, 23K, 18K, and 11K. Most search results for "BASR INVITATION PORTAL" were related to administrative portals, software logins, or invite-only programs that are not running races. Therefore, without specific information about the "BASR INVITATION PORTAL" race, I cannot provide a compelling and accurate description.