Campaign staff and volunteers of Sen. John McCain and his former vice presidential running mate Sarah Palin are preparing for the pair’s appearance at Mesa’s Dobson High School on Saturday. A spokesman for the camp offered a bit of advice for those wanting to get in: “Folks should get there early,” said Brian Rogers, McCain’s communications director.The event is free, on a first-come, first-served basis and does not require a ticket. (snip) Also speaking at a rally in Tucson on Friday, the appearances are McCain and Palin’s first ones together at a public event since their concession speech in the...