Was it a younger crowd? Maybe they have even never heard of Deep Purple...
Several clips of the show at the Starland Ballroom can be found on this YT channel.
http://www.youtube.com/user/AlexNeff66/videos
Yes, younger than me! I'd say in their 30's.
Also, I hope to download the complete audio from the show on Soundcloud. It is all ready...posting soon...unless the band objects!