Trine,
I think traditions that are generally fun for kids and family are usually spread very fast. Sorry to hear about the poor kid that got hit on the head though. I guess I can't blame the guy for doing it since it's not a wide spread tradition as of yet. Acutally it's not even an American tradition. It started in Ireland with the Celts and their Druid ceremonies and somewhere along the line got a Christian association buy being the eve before All Saints Day or All Hallows Day as it was called. We Americans just revamped it and made it more fun.
Bandit,
Halloween didn't become an adult holiday until the Baby Boomers who grew up trick or treating decided they didn't to give up on their childhood fun. It's only been the last 20 or 30 years that adult parties have taken off. I love making costumes and have made several that won contests. My son wanted me to make them every year for him after he won his first costume contest.
Guy Fawlkes seems like a fun celebration but I suspect the Fire Marshals here have enough of a time keeping up with the fires on the 4th of July.

DJ