Organizers
- Cabbagetown Initiative CDC
- Caffe Lena School of Music
- Cahokia Mounds Museum Society
- Cal Poly Triathlon
- Calabasas Community Services
- Calico Canvas
- California Fire Mechanics Academy Inc.
- California State Parks - Point Lobos Dive
- California Yacht Club
- Callanwolde Fine Arts Center
- Calumet Park - Parks + Recreation Department
- Calvary Baptist Church Academy
- Calzaghe Mini Dragon Limited
- Cambridge Pickleball Club
- Camp 4 Champs ( Ofsted URN: 2524475)
- Camp 4-2-11
- Camp Appanoose
- Camp Big Heart
- Camp Caleb
- Camp Crucis
- Camp Ecolart San Diego
- Camp Encounter, Champion, LE and Honors Camp
- Camp Fire Central Texas
- Camp Fire Long Beach
- Camp Fire Minnesota
- Camp Fire San Diego
- Camp Gilead
- Camp Haluwasa
- Camp Hope of East TN Registration
- Camp Illiana
- Camp Kahuna
- Camp Latona
- Camp Mak-A-Dream
- Camp Manitowa
- Camp One
- Camp Pearl Ministries
- Camp Peniel
- Camp Phoenix
- Camp Shine
- Camp Tanako
- Camp Tekoa Inc.
- Camp Twin Lakes
- Camp Waziyatah
- Camp Wesley Pines
- Campbell River Youth Soccer Association
- Camps by KT
- Canmore Preschool
- Cape Cod Theatre Company / Harwich Junior Theatre
- Cape Elizabeth Community Services
- Capilano University Athletics and Recreation
