Cook side dishes before your trip, or visit the deli section of your favorite supermarket or deli to stock up on prepared selections, being certain that you will have the ability to properly refrigerate your choices during your trip.
No matter what kind of leaves you end up making, be sure to store them in airtight containers (and possibly refrigerate, depending upon ingredients) for safekeeping before the wedding.
Tomatoes should be stored at room temperature for best flavor but if you plan on having them for more than a day or two go ahead and refrigerate them.
If you cut too many leaves you can refrigerate the extra for a day or two or put them in ice cube trays, cover with water, and freeze for later use.
If you store food in airtight containers and refrigerate or freeze your food, you reduce the risk of illness and increase your food safety.