One of the best things I ever did in my life was forego attending my own graduation ceremony. At SBHS that meant I'd get out of school days earlier. Oh joy.
My best friend and I, on graduation day, hiked up Tunnel Trail with my dog and spent the afternoon basking naked beside a mountain pool. Only drawback was our asses were so white we ended up with a bit of a sunburn, but it was worth it.
Teachers don't need to be at grad ceremonies, if they don't want to be. I should think it would be horrendously boring.