It can be singing, band, dance.. any music related performances and/or competitions.
Just share about your experiences! =DD

As for me, I'm pretty involve in church worship team and those small performances for special events such as Christmas, Easter day and so on. The biggest performance I've been involved before was a musical titled Friends.. Forever. We used almost 2 years to prepare this musical, and went to churches and colleges to perform this musical. It was a great experience. :3

As for competition lol. It's so coincident that I've two audition next weekend, Saturday and Sunday, from two different organizers. One is a public singing competition organized by Station One Cafe (if you've heard of it?), and the other one I joined with my friends as a band (I'm the soloist) for my music school's concert. I'm darn excited and at the same time, nervous. ^^;

Maybe I'll post about it here after they finished.
For the time being, your turn! Lol xDD