Pendulum are a difficult one to place because it’s been so long since they actually toured so it’s a guessing game what the demand is.
However, in a year where Alter Bridge, Ghost, Parkway, Evanescence, FFDP, Pantera, Prodigy, Nightwish, Limp Bizkit, Incubus, Tenacious D, QOTSA, MGK etc are all on the festival circuit Pendulum being booked as 3rd down doesn’t seem impossible