Devils on wheels

Walking out of the supermarket last night, we bumped into these red devils on bikes. Is this a tradition? No, we had never seen it before. Is it Halloween? No, we are closer to to Christmas than to Halloween.

I had to find out, so I asked them why they dressed up like this on a random Wednesday night?  And as you can see they became all sweet and smiling: they were going to a devil party organized by their sorority!