The Annual Mission Reach Flotilla Fiesta set to take place in June �� The San Antonio River Foundation and the San Antonio River Authority are inviting the public to attend the Annual Mission Reach Flotilla Fiesta. Credit: San Antonio River Authority Author: Natassia Henry Updated: 12:35 PM CDT May 17, 2021 SAN ANTONIO — The San Antonio River Foundation and the San Antonio River Authority are inviting the public to attend the Annual Mission Reach Flotilla Fiesta. The Mission Reach Flotilla Fiesta will take place Saturday, June 19, from 10 a.m. to 2 p.m. at the Mission County Park trailhead located at 841 VFW Blvd. This year, participants will get to take part in an obstacle course to test their skills and enjoy a fun day along the San Antonio River, according to a statement from the San Antonio River Authority.