Post Malone announced the lineup for his second-annual Posty Fest on Sunday and Pharrell Williams among others will perform at the Festival. Posty Fest tickets go on sale today (Sept. 11) for those interested in the Citicard pre-sale, and Sept. 14 for the general public. Post Malone’s Runaway Tour kicks off in Tacoma, Wash. on Sept. 14 and wraps Nov. 21 in Los Angeles.