C5 Communications (C5 Group)

C5 Group (branded on its site as C5 Communications or C5) is a global event and conference organizer that runs defense, government, and national security-focused summits and forums (e.g., Defense & Government Summits, C5 Cyber & IT Forum, C5ISR-related events). Their company site describes 40+ years of running sector-tailored conferences including Defense & Aerospace, Military & Government, and National Security topics; they list conferences across global locations and specific defense/security events. This aligns closely with the user's intent to find defense & military conference organizers.