Dane Dances offers several good photography options with the band, people dancing, and Monona Terrace rooftop views. I'm going there with other meetup groups but can break away for a while to take photos with people from our Photography Meetup group. I plan to get there about 5pm to eat first and will provide my cell phone number to those who RSVP.
I can't fully commit to being an official organizer for the whole evening but I will do what I can or maybe someone else will want to take over as organizer. Those who rsvp can either take photos on their own, or in small groups, or meet in one big group if we can all find each other. Here is the music schedule:
V05. 6:00 - 70s disco and dance
The Davis Family Band. 8:00 - Rock, blues and R&B