CTF for High schoolers

Howdy everyone

I am working on a short summer for high schoolers that introduce young students to cybersecurity. My teammates and I are interested in having a CTF event and I was wondering if anyone knew of an entry-level, or a CTF that would be suitable for high schoolers that are beginning cyber security.

I know it's a shot in the dark, but any and all pointers are greatly appreciated.

ctf cybersecurity