As if he should be surprised that less than a week from a four-day national holiday weekend, people might have already made freakin' PLANS!

Taking time off from work that one is entitled to should not be stressful or "guilt inducing." You've earned the time off, and with reasonable notice it should be granted. Likewise if Glenn needs people to work over a holiday, he should bring that up well in advance - at least a couple months. It's not like no one knows when the national holidays are until less than a week out.