When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
byggstudio.com
Byggstudio
The downside of a flat, not concertina structure is that you would need a large footprint like here for stability, so I guess this is dependent on the kind of space you usually have at shows and whether or not this kind of base would be well annoying
