I disagree about doing only one rave but I do agree that they aren't family friendly. You know what else isn't family friendly? Yaoi/yuri/hentai/people getting their intestines ripped out/PedoBear cosplays/the Human Centipede cosplay/etc. If Acen was really a family friendly con, it would only show anime, have panels related to, etc. to anime rated PG-13 (may have to knock it down to PG) or lower.
Honestly, they need to drop that mindset IMO or at least make daytime family time and have night time be for the older crowd. ACen will attract a non family crowd, not only because of the raves, but the anime related content too. Again, aside from my gripes posted in another thread (cap on Chris Sabat, this year's unenthusiastic karaoke panels, and the Crystal Ball not being worth $25) ACen was awesome for me. Also, I thought while yeah there were some non-anime panels, they still had plenty of them and I went to the Mortal Kombat martial arts panel and though it was well done. C2E2 had two stand up comedians at the end of the con Saturday night that were hilarious and didn't do any comedy related to comics. I don't think me or several others cared. Also let's not use the "it's also known as an Entertainment Expo" excuse, you know most people consider it primarily comics, lol