The nearest airport is Aalborg Airport (AAL). Upon arrival take the 12, 71, 200, 70, or 24N bus to Aalborg Bus Terminal (20 minutes). From here, take the 100, 50, 50N, or 950X bus to J. Petersens Vej. The festival entrance is located across the street from the bus stop.
Nibe is accessible from elsewhere in Denmark and Europe via Aalborg, but requires at least one transfer.
Yes, there are many camping options at Nibe Festival, ranging from normal tent camping to glamping and even caravan options.