Before every competition, my high school theater group would circle up, and shake all of our bad mojo/energy into the center of the circle. It usually involved some brushing off, fake vomiting, booty-shaking, etc until our jitters were out of like two minutes had passed. Then we all visualized that nasty ball of nervous energy, lifted it up as a team, and and threw it far far away. It made us perform better.
This is a ritual the theater group would conduct. For superstitious reasons they would join in a type of bad mojo warding dance. Obviously this ritual provides comfort, marks the occasion of the competition, and provides a good placebo affect, but the biggest benefit is likely that the team members joining together to do an embarrassing dance provided the club with a strong feeling of community.