Organizers
- City of Santa Maria
- City of Santa Monica
- City of Santee
- City of Scottsdale
- City of Sheldon Parks and Recreation
- City of Sierra Madre
- City of Spruce Grove
- City of St. John's (NFLD)
- CITY OF TEMPLE CITY
- CITY OF TRACY
- City of Troy Rec Dept - Troy Bruins Youth Hockey
- City of Tulare Parks & Recreation Department
- City of Vista
- CITY OF WARRENSBURG
- City of West Hollywood
- City of Westminster
- City of Wichita Falls
- City of Wilsonville
- City of Winnipeg
- City of Wylie Parks and Recreation
- CITY OF YORBA LINDA
- City of Yucaipa Community Services
- Civic Theatre of Greater Lafayette
- CL Events - The Official Camp of UK Athletics - Softball
- Clarendon Lions Club
- Clark Power Skating
- Class Act
- Class Act Community Playhouse
- Classic Race Services
- Classroom Antics
- Clear Space Theatre Company
- Cleveland Flames Hockey
- Clifton Park Youth Hockey Association
- Clippers Camps
- Club Mountaineer Aquatics
- Club Oly Road Runners
- Club SciKidz Atlanta North
- Club SciKidz Austin
- Club Scikidz Central Long Island
- Club SciKidz Charlotte North
- Club Scikidz Columbus Ohio
- Club SciKidz Dallas
- Club SciKidz Houston
- Club Scikidz North Seattle
- Club SciKidz Orange County
- Club Scikidz Queens NY
- Club Scikidz Riverside
- Club Scikidz South Charlotte
- Club Scikidz Treasure Coast
- Club SciKidz West Chicago
