A designated spot to link to supporting acts during the show
as opposed having to mention in notes, designation a space to list other artists which will then have THEIR set linked to
Once you've added a setlist, there should be a link to 'add another band' to a particular show - clicking it will create a new setlist, pre-populated with the same date and venue as the previous entry, so you can more easily add support acts
Adminsfussenegger (Admin, setlist.fm) commented
@georgethe23rd would be a nice idea, but it will probably won't work as expected for older (> 5 years) setlists.
Another suggestion: what about storing not only date but also time (optional) for a setlist? I think this is simpler than ordering by popularity. As, for instance, the main act on Benicassim Festival, Spain, played in the middle (while the last band started around 4am or later).
Adminsetlist.fm (Admin, setlist.fm) commented
@JustDerek: as leglessmoof said, concerts on the same day for the same venue are in the upper left corner - usually it should be pretty clear who opened for who but if it isn't there's always the possibility to add an @Info[Lamb of God and Mastodon opened] at the very end of the setlist ... and in one point you're wrong: the site's called setlist.fm and not setlist.com ;-)
When setting up a new event on last.fm, it guesses which acts on a bill or festival were headlining, and which came beforehand. According to how popular each act is.
Maybe setlist.fm could do something similar?
Leglessmoof is correct about the Related Setlists section. It does seem like there should be some indication that Artist #1 was the *opening act* for Artist #2, etc... although I guess the site is called Setlist.com, and is thus most concerned with the artists' setlists rather than who opened for whom - or am I wrong?
Setlist.fm already has this feature, although not exactly the way you are describing it.
If you add the support act's setlist with the same venue name, it will link to it in the "Related Setlists" box in the upper right side of the page. The venue name has to be exactly the same in order for it to work.
Take this Metallica setlist for example. You can see it links to the support acts' setlists (Lamb Of God and Mastodon).