People expect others to naturally be excited for events you can't participate in. For example your siblings' competitions. It is no fun sitting on a set of bleachers for two hours straight. This is how to look like you're enjoying those two hours.
Step one, act involved. Clap for everyone, and take lots of videos and pictures. After each person yell some random name out loud preferably, “ GO EMMA! WHOOOOOOOOO!” Step two, Be really loud. Tell your vocal cords to put on caps lock.
Step 3, Have conversations. I normally have random conversations with the people around me because they're probably pretending to enjoy it too. Step 4, Drink lots of water. It is a perfect excuse to get up and leave to go to the bathroom. Lastly, go home and take a nap, because gymnastic meets are still super boring.