As the ceremony is at 2:00pm and the reception doesn't start until 5:00pm, you could: Grab a drink at Dish, the Flintridge Proper, or Los Gringos Locos. Have a coffee at Constellation or Cocoa Noir. OR, there are a bunch of fun spots just a short ride away in Pasadena or Montrose as well... Pasadena - King's Row, the Blind Donkey, Copa Vida, Lincoln. Montrose - Basin 141.
Please plan on Uber/Lyft-ing to and from the ceremony and reception. There is parking at the church as well as Descanso Gardens if you'd like to drive.