We're not planning on getting crazy, but the current plan is to make a very sturdy structure using "build your own" carport fittings designed for 1" EMT tubing. It would be shaped mostly like the typical EZ-up tent with four legs at the corners of our booth area. We've seen some clubs try to build a banner stand out of flimsy PVC and go really high but it's a disaster.
While height is the current question, the above posts about actual booth area is obviously a concern with a structure like this. We'd like the banner to be a wide as possible and while the support structure can be cut down on sight, once the banner is painted there's not a whole lot of scaling that can happen.
Now that you mention touching base with clubs, I don't recall being contacted even though we signed up twice apparently in two different registration systems that were rolled out over time. What date did the email go out so I can go searching? In any case, the WHALES are definitely coming.