I also remember it like it was yesterday.... please excuse the long post while I reminisce...
My first Maiden concert (and first concert at all) was Powerslave tour in 1985. I saw Maiden play at the legendary Radio City Music Hall in NYC with Queensryche. I went with a friend and my father (was only 13 years old). I guess my dad figured it would be a relaxed sort of atmosphere given the venue, little did he know.
We waited on line three hours to get in because security had everyone check thier spiked bracelets and gear at the door (was the fashion at the time) and this was only the beginning.
Radio City is a concert hall, no standing room and all the seats in the floor section are plush and bolted down. SO the show starts and 6000 maiden fans stand up on these fancy seats and security has a fit... They cant get EVERYONE to sit so they eventually admit defeat and leave us alone. About 4 songs into the set, a few chairs started smouldering (smoking was legel in public places back then). The seats are bolted down so security had to rush from the consession stand with cups of water to put out the potential fires.
Needless to say the entire show was the best I've ever seen. We were some of the last to leave the hall and let me tell you it was a sight to see. Broken chairs and rubble strewn about where all that remained of the rowdy maidens that invaded Radio City Music Hall that night.
Since then I have not heard of another metal band ever playing that venue...