The phrase "to schedule an appearance" means to arrange or set a specific time and place for someone to be present or show up for a particular event or activity. Full definition
Dietl issued a press release this morning, dubbing himself «Feisty Bo Dietl,» touting his and Malliotakis» scheduled appearance at a candidate forum Tuesday evening. (newyorktrue.com)
The most brazen push, though, is in Arizona, where the campaign has also scheduled appearances on Mrs. Clinton's behalf from her daughter, Chelsea, and Senator Bernie Sanders of Vermont. (nytimes.com)
Louis C.K. and Jeremy Piven both missed scheduled appearances for that reason, while Ben Affleck showed up in November to discuss the groping allegations against him. (vanityfair.com)