Calm a breastfeeding baby ?

My 6week old seems to be extremely fussy unless on the boob, usually I let her soothe herself but I do need time for cooking dinner, cleaning, etc. Her daddy and I want to have a dinner for our anniversary tonight but i’m nervous leaving her wifh grandma since I won’t be around to give the boob. I’ve pumped more than enough for her to eat but i’m worried about her crying for the boob. Any advice ?