I'm currently working on a multi-site network with 40 sites in it.
Events Plus appears to do what I need, with one exception:
The events on the calendar are free, open to the public, and require no reservations.
In this network, registration and commenting are turned off.
We'd like for people to be able to provide an email address and then receive an email with the event information in it and a reminder a day or two before the event.
We use Events Manager Pro, which does allow this, but since we are paying a significant amount of money for support to you guys each month, we'd like to retire Events Manager Pro and use Events Plus instead.
In fact, even better would be if they could enter a cell phone number as well and then receive an SMS text reminder!