The Mets will christen Taxpayer, um, Citi Field with a two-game charity exhibition series against the Red Sox on Friday, April 3, at 6:10 p.m. and Saturday, April 4, at 1:10 p.m. Full season-ticket holders will have both Red Sox exhibition games included in their ticket packages at a substantially discounted price compared with regular-season games. Single-game tickets for the Boston exhibitions will be similarly discounted and go on sale in the next couple of weeks, the team announced today.