Negative matching using grep (match lines that do not contain foo)

I have been trying to work out the syntax for this command:

grep ! error_log | find /home/foo/public_html/ -mmin -60

OR:

grep '[^error_log]' | find /home/baumerf/public_html/ -mmin -60

I need to see all files that have been modified except for those named error_log.

I’ve read about it here, but only found one not-regex pattern.