Statistics on demographic data
The libraries in a cooperative would find it valuable to get demographic data on who is registering for events. If the person registering for a program is an existing library patron and Vega Program is connecting over to Polaris/Sierra to validate anyway, it ought to be possible to grab demographic data to report on.
It would also be helpful to get data on people who register for programs but don't have a library account. There could be an "opt-in" checkbox on the registration form to facilitate communicating through Vega Promote campaigns.