ELLSWORTH, Maine — Once a month a group of bicyclists gathers outside City Hall and, after reaching consensus on where they should go, they pedal off to explore the city for an hour or so and, with a little luck, get noticed by other people. But it’s more than just a ride. On its Facebook page, Ellsworth Bike Party says it’s “just for fun,” but for its primary organizer and many who participate in the monthly rides, there is a larger goal. The city of 8,400 residents is the main service center in Hancock County.