BOX OFFICE: LOCATION: East end of Round-Up Ground (metal ticket booth) during the day. Go the the Convention center during the night. Box Office: (541) 276-2553 or 1-800-45-RODEO Will Call: (541) 276-2553 Accessible Seating: (541) 276-2553/1-800-45-RODEO Ticketmaster Charge-By-Phone: (503) 224-4400 Pendleton Chamber of Commerce: 1-800-547-8911/(541) 276-7411 WILL CALL: At box office.