chinese on christmas
They'll all be open. Christmas is especially busy for Chinese restaurants, groceries etc. in the San Gabriel Valley and Chinatown because most Chinese workers not in those businesses have the day off. All of the dim sum restaurants will be very crowded, very early. For Shanghai I guess the best would be King's Palace, 250 W. Valley in San Gabriel (upstairs in back). Also, Mei Long Village, across the street at 301 W. Valley #112.