Are They Really In Costume?

So, here's what I can't wrap my head around this week - why is everyone celebrating Halloween so early? I totally understand if it's on a weekend, but it's not - it's on a Monday. Why are they having people dress up at work today? Yesterday I saw someone at Costco wearing deely-boppers on her head and a horrible outfit. I'm afraid the outfit was just her poor clothing decisions, but the deely-boppers concerned me. Does Halloween being a week away allow everyone carte blanche to do what they want? Last night at the mall I saw a woman walking around in PAJAMAS. That better have been a costume. Otherwise....oh, dear.