Revolution 3 Triathlon     https://rev3tri.com/  
 
French Creek Racing      https://www.frenchcreekracing.com   Open water swims including near Thurmont/Cunningham Falls
 
Racine Multisports   www.racinemultisports.com  Multisport, running and open water swim races in MD & VA
Others 
Additional websites to find races:
 
For more information on USAT events and membership: