Reservations for all of the lots at Balloon Fiesta tend to fill up pretty quickly - they are very sold out (and waitlist is full) for the 2019 Fiesta. There used to be 'walk-in' sites available, but looks like they've done away with that perk for 2019 and only those with reservations will have an RV spot. RV spot reservations for the 2020 Fiesta go online (become available) on October 22nd, 2019. Historically, they open up about a week after the previous year's Fiesta and sell-out rather quickly.