I too am "avoiding" work duties, but I thought I would take a minute and share a bit. My undergrad degree is a double major in theatre and political science and then I went on to law school. (Unfortunately, I had to take a medical leave in the middle of my first year. I haven't made it back, but I currently work in an administrative capacity in a law firm during the day while I take on various theatre projects in the evenings.)
That being said, it is possible to go to law school with a degree in theatre. And it's definitely good for conversation. People are constantly amazed when I tell I have a background in theatre and political science. (I also know people who have gotten political science degrees who worked both in the theatre department and after they graduated with professional companies as stage managers, so you don't necessary need a theatre degree to be able to continue with theatre after college. Experience can help fill that gap.)
However, both stage management and law can lead to demanding careers. Especially in your first year of law school, it's near impossible to do anything else except focus on law school while you are in school. After your first year, you should be clerking or interning during your summers and/or during the school year. So don't expect that you will have much free time to participate in theatre while you are in law school. There just aren't enough hours in the day. (I'm sure that it's possible and there is someone out there who will have proved me wrong, but generally speaking that's how it is.)
I'm not sure what you plan to do with your law degree, in terms of what kind of law you want to practice, etc., but I can tell you that the associates in my firm (we deal mostly with civil litigation defense) work long hours, evenings and weekends. It's not exactly the kind of job where you are guaranteed to be done every day at 5. (Plus law school is expensive, so you have to make enough money to be able to pay off your school loans.)
Anyways, I hope that's helpful and not too discouraging for you. Ultimately, you should do what you love and finds ways to make things work. If you want to talk more, feel free to send me a PM. I'd be happy to answer any questions you might have. And now I really must get back to work.