Galvanized tub how big?

Would a 16 gallon galvanized tub be big enough to sit at the end of buffet line for people to grab drinks out of? its a supper causal wedding at a park im thinking i'll use it as a planter after the wedding just so its not a 1 n done kinda thing we'd still need 2 smaller ones for water and kids drinks (capris suns, juice bottles)