Taos, NM
During Balloonfest, last October. Of course the big, big balloon fiesta is in Albuquerque, NM with hundreds of balloons. A bit later in the month there is a smaller festival in Taos --- maybe 30-50 balloons --- where you can go right up to where they are laying out and inflating the balloons before launch. And if you want, you can stick your head (and a camera) inside.
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