Help!

My mother is taking my son up to her sisters for forth of July. She will be leaving Sunday night and won't be back until Tuesday. Of course I will have to pump. I am going to my fiancées moms friends house for a party. I'm not sure what time it starts but I know I will have to pump before I go and I don't wanna pump while I'm there. I manage to go 6-9 hours without having to feed and my breasts are still soft and swuishy. I think my milk supply Maybe low. I have heard that ice and/or green cabbage leaves help with milk production. I also want to stop feeding all together. What should I do? I'm afraid of getting all hard and uncomfortable at the party.