A side project of members of Earthbound featuring Bob Caldwell, Paul Seale and Colin Robbins. Under the direction of Colin, Shamrock's name was an inside joke, because the members felt that Shamrock was, indeed, a bit of a sham. But it helped these prog musicians pay the rent.
For physical events that happen at a specific time. For example a concert, or dance performance. If there are multiple shows, you can still duplicate your event to cover them all.