Butterfly,
I've been following your story for a bit and I think it's great that you're bringing Greeks to RIC--I grew up in MA and I really like seeing threads about the area. However, I would caution against having a ton of mandatory events over the summer, even if people are around. As you know, being in a sorority is really rewarding but it can also get stressful. As a collegian and through my experiences volunteering as an advisor as an alum I realized that a lesser time commitment over the summer is highly beneficial, if not neccessary. It gives sisters a chance to decompress and reflect on their experience and hopefully return to school refreshed and ready to go.
Of course, an event or meeting here or there (or when neccessary for planning) can help keep people involved and your development as a new chapter moving forward. Just my $0.02