Can I make address optional?

I have businesses that have physical addresses and ones that do not, and will travel to you. (Like princess parties and such.) Some that will travel to many different cities, are available all over my area.

So I know I can make custom posts, but I don’t actually want to make the “virtual” or traveling businesses a separate type…because I still want ALL these business together in their appropriate categories.

For example…I have a category for birthday parties and a sub category for children’s entertainment. If I had a whole separate post type for physical and virtual businesses, then I don’t think I could group together ALL the children’s entertainment businesses…I want them all together in the same category, not segregated by whether or not they have a physical location. I don’t believe people will care about segregating out the physical vs the virtual. There’s no need to have them separate. But as it is, the address field is required, so I’ve had to have a note like “no physical business location” in the address field…which feels messy to me. AND it gets particularly messy in the city field when you are talking about, again, for example, a princess party business that will travel to any city in our county and even adjoining counties.

What would work best for me would simply be to make the address field OPTIONAL. So it ONLY needs to be filled out if they have an actual physical location the business wants shared with the public. And if they don’t, then they leave it blank, and it doesn’t show on the front end.

Is this possible? I see no box to uncheck to make it not required.