What to Pack for an Outdoor Food Festival

Packing for an outdoor food festival is a slightly different exercise than packing for a normal day out, mostly because the day involves a lot of standing, a lot of variable weather, and usually more hours outdoors than a typical afternoon errand or museum visit.
Footwear matters more than it seems like it should
Festival grounds are grass, gravel, or packed dirt more often than pavement, and a few hours of standing and walking on uneven ground in the wrong shoes ends most people's day early. Something already broken in, with real support, beats anything new or purely decorative.
Layers, even on a day that starts warm
A fall festival can start in genuine warmth and drop ten or fifteen degrees by the time the sun goes down, especially somewhere without much shelter from the wind. A light layer that packs down small is worth carrying even on a day that looks unnecessary for it in the morning.
Cash, a refillable water bottle, and not much else
Card readers are common now but still not universal at every small vendor table, so a bit of cash is worth having as a backup. A refillable water bottle is worth more than it sounds like it should be — standing in a food line for twenty minutes in the sun is thirsty work, and festival drink stands tend to have a line of their own. Beyond that, a bag small enough to carry comfortably for a few hours, sunscreen if it's a daytime event, and not much more.
Most of this applies to any outdoor food event, including our own — see the Hillsborough Oyster Festival guide for what's specific to that one. And if packing for a single festival day has you thinking further ahead, our notes on planning a whole festival-season travel calendar cover the bigger picture.