Table tops and shelves are from IKEA, very lightweight. Shelf uprights are made of corrugated plastic. Folding tables support everything, and provide storage underneath.

Here's another version of my booth where you can see the track lighting. I use (2) four-foot lengths of track, with (8) light fixtures total. Everything is installed with cable ties, the tracks are cable-tied to poles, which are cable-tied to the frame of my canopy.