It sounds like fun; going out to the edge of your land, building a little fire, and having a feast with your neighbors (just don’t forget to sprinkle the boundary with lamb’s blood). The god of boundaries clearly had no boundary issues of his own: When Jupiter’s temple in Rome was being built, Terminus refused to move, so they gave him a little shrine and made Jupiter share his space.
The festival of Terminalia also bounded the year. Before Julius Caesar fixed up the calendar, this was the its last day. Poor February, even more short-changed back in those days.