Summer Sporting Events How Do You Handle Taking Your Young Kids Places When There May Not Be A Bathroom Available?

How do you handle taking your young kids places when there may not be a bathroom available? - summer sporting events

My daughter is 4 1 / 2, and then it is definitely diapers when she needs to go, they need to go. How can I go and do things when there is a bathroom here? For example, riding sport in the summer or something like a special train, you know that you do not have access to one for an hour while on board.