I don't want to blow my own trumpet or self promote, unlike some, so if any really clued up mod can decode my real IP address, please don't.

My band and I went to a local club - sang a couple of floor spots, and they first asked us to do a support and then a headliner. We went to another - a bit grander, elsewhere - did one song and they asked us to do a support (for a prestige artist) and a later headliner. I rang a local festival organiser and asked for a slot during the festy and he offered two (but the rest of the band balked one of them).

I think that's the way to do it.