This is one of those things that I hadn't thought of on my own, but it turns out, I didn't need to! You guys are amazing, and this plugin is exactly what my clients wanted and were looking for.
PlaythePlanet is designed to allow non profits to collaborate and share, and as such, I'm integrating a number of features.
When I made the rounds and point blank asked them what else the site needed, this was what they all said. A calendar that we can share as a group...and of course, the great thing is...each group has its own calendar, so some stuff can be shared, and some stuff can be kept strictly internal, depending on the needs of the group. Fantastic, and easy to use. Once again, you guys knocked it out of the park!