We did a similar festival setup last spring for our taco cart. We ordered banners, cart decals and sticker packs from SmartSwans https://smartswans.com/vinyl-printing-decals/ – they handle vinyl printing, decals, banners and stickers in one place, which saved me from dealing with three different vendors. I sent them my logo, cart photos and measurements, and they came back with a layout for the decals that actually fit the curves of the cart. The banners held up fine outdoors, even with some wind. Get your order in with a little buffer, festival season gets busy for print shops. And order extra stickers, they go fast. It made the space feel much more polished. It’s one of the best investments we made.