I've worked a tower in an area that was very busy with balloons. From the ATC perspective it was no great problem and the balloon pilots would climb or descent to fit in with aeroplane patterns etc. The thing about balloons is that they only tend to fly when the weather is nice and they're easily visible.
I do seem to recall reading about one problem a year or two back when a balloon was going under the final approach having descended below the glidepath but suffered problems from the wingtip vortex generated by a jet passing overhead on final.
Have you visited your local airport ATC for a chat?
And are you flying at the Fiesta?