Do they understand how bad traffic is on Friday night? Then you add in the people headed for the scrimmage and most people getting off at 5PM and you've got a perfect storm of suckiness. I was planning on going down with my dad but he's stuck in traffic and so my options are to go by myself or wait for him and pretty much miss the scrimmage.
Next time give people more than 1 hour to get from work to the scrimmage.