Shi: Oh no! I hope it all works out for the best.
Mitsu: Don't worry about it. Many people, probably clumsier than you ie me, have managed just fine with their 5' flagpoles. The trick is to keep it close to your body. And for propriety's sake, keep your flag off the ground. The easiest thing you can do to make sure you aren't dragging is to tuck the top corner into one of the holes and pull it through. It's pretty easy to pull out, even with a cheap polyester flag like mine, and you don't have to worry about doing something horrible to someone's national pride. : D
Sak's a bit neurotic with its weapons policy, so you will probably need it peacebonded. I don't remember if that was a thing at Kcon. Regardless, it's not that much of an imposition.