3 ring binder with clear plastic sheet protectors that you can insert the paper into. Keeps them from blowing away, stays organized - you can pop them out and re-order them for various events, keeps music dry in the event of any rain or mist, etc. You can even use a marker (any color) on the outside of the sheet protector to mark up music without damaging the paper itself. You can also cut things to size (I did this with pieces that were so short 2 would fit on a page) and if you need a "fold out" you can still go old school and tape the edge on. You could also put 11 x 17 (or whatever the equivalent is) on thick paper with holes punched in one edge, fold that in half and either print music on it or glue it on, so you can spread 4 pages out from the center of the binder.
There are such things as "dual width" stands, though most people I know simply use a piece of cardboard.