Yes! The mother of indoor rowing competitions is the CRASH-B Sprints, held annually in Boston. The Charles River All-Star Has-Beens started when the U.S. boycotted the Olympics in 1980 — during the same era that Concept 2 launched their Model A; necessity met opportunity. CRASH-B is still held with aplomb and doesn’t require any special qualification of its applicants.
In sweep or sweep-oar rowing, each rower has one oar, held with both hands. This is generally done in pairs, fours, and eights. In some regions of the world, each rower in a sweep boat is referred to either as port or starboard, depending on which side of the boat the rower's oar extends to. In other regions, the port side is referred to as stroke side, and the starboard side as bow side; this applies even if the stroke oarsman is rowing on bow side and/or the bow oarsman on stroke side.