Looks nice. Being compatible with Blogger themes is a smart move. How do you plan to compete with Google Pages, Weebly, and all the other site builders? A calendar and a member directory might not be a big enough differentiator.
Actually, Weebly isn't much in the same space. The newly re-designed Google Sites (Jotspot 2.0), site/wiki builders like Wetpaint, or social network builders like Ning are all in the "facilitate group communication" space, and all look to fill the same need.
we're not so much in the 'group communication' space as the 'web publishing' space. our main goal is to make interesting/useful/rich websites (though we may harness group communication for content). we want these websites to be valuable for those within the group AND mean something for those outside.