Ok, to be honest I understand the parents. If they didn't remember there WAS a special event I'd agree they were being clueless, but not remembering the time isn't that unusual. At any given time a parent usually has to remember a dozen different appointments for himself/herself and kids, at different places and different times. Of course parents should all write appointments down, all the time. But even then, there will always be someone who did, but left their notebook at home, or noted the event and the date but not the time, and has to call to check.
Just being human, I'd say
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett