I think this is a pretty unfortunate problem -- basically once you navigate away from a local homepage (to any other page, like events, or a posted message), there's no way to get back to that homepage. There needs to be a " Local Home" link of some kind at the top of the page. Otherwise our local sites are seriously disadvantaged.
Where is the link on a local site to that local group's Events. No one needs a global listing of Events except in rare cases. Every member of a local group needs a clear way to get to a list of local events.