My homeowners insurance is due tomorrow.I forgot to call and pay it today.They will not be open again till Monday.I can't pay online.Can they cancel me or charge any crazy fees for being 2 days late?

I dont think you will be charged with any "crazy" fees. There might be a late payment penalty of something like $25. Check with your HOA paperwork to be sure. I have missed my payment date a few times, but there were no penalties. If you are regularly late, the consequences might be late fee penalty charged to your account. Check with HOA when in doubt.