Drink near Nokia Theater
Roy's is a relatively short walk (under 10 mins., about 3 blocks) from the Nokia. They have a nice selection of cocktails, and you could enjoy a very nice appetizer or plate of sashimi beforehand. Roy's also has a shuttle that hits all of the major venues around downtown, from Disney Hall to Staples, in the event you decided not to walk (you could just park your car with the valet at Roy's if you like).
800 S Figueroa St, Los Angeles, CA 90017
From what I understand many of the restaurant in the Nokia Center will be opening within the next week, including full bars. When is the show? There are 12 planned restaurants going in - when I was at Club Nokia earlier this week, it looked like some were definitely ready to open.