DS18 was involved in every possible fine arts activity he could have been in high school -- band, jazz band, madrigals, a cappella choir, and all 12 shows. We went to all concerts, and about 1/2 the football games where the kids marched. Shows -- it depended on whether he was on stage or backstage -- onstage for all four musicals and a couple of other shows, and then we generally went once each weekend (although since I was one of the most involved parent helpers, I would usually sneak in at least one more performance -- i took the photos that the kids would get at the end of the year); if he was backstage, we would generally go once. Over the summer, he had a lead in a community production (Gaston in Beauty), and I paid to go once, but volunteered twice more so I got to go then as well (out of 7 performances). We went to most of the shows his rock band gave (although if they had stayed together and performed more, we wouldn't have gone to everything). When he was younger, we went to every karate tournament. Now that he's in college, 45 minutes away, we probably won't go to everything (and the school webcasts most of the concerts, so what we don't go to, we can watch). Now, DS15 is a different animal -- we'd love to go to his stuff; unfortunately, he's not involved in stuff to go to (but we did go to every soccer game when he was little, as terrible as they were...)
I don't think support necessarily means that you have to be there each night. He knows we support him because we help out where needed, make sure he's at all rehearsals, buy the t-shirts and program ads. It's partly financial that we don't attend everything (and $25 for a ticket??? man alive -- I thought ours were expensive at $10!), but we want him to learn that he performs for HIS enjoyment -- we definitely enjoy it too, but he doesn't do it for us -- and we want him to be able to manage without us around, knowing he's in our thoughts even if we aren't there in person. He's a star in our eyes, whether we're there or not.