For those flying in, LAX and Hollywood Burbank (Bob Hope) are your main options. If you find a good price at Burbank, book it! 

A hotel block is available with the Pasadena Hilton at 168 S Los Robles Ave.
Book by clicking this LINK.
You may also call the hotel directly to book at (626)577-1000 and mention the “Wylie/GatesWedding”.
Please reserve your room by May 8.