So this placed that I interviewed with said that I should expect to hear from him at the beginning of March. It is the beginning of March and I haven't heard shit

He didn't even respond to my thank you email the day after the interview. I thought the interview went pretty well. However, I would like to work at this place because it is in New York, amongst other reasons. What should I do? Should I wait until the end of the week and if I do not hear anything, email him on Monday? I'm freaking out because I need a summer job and I have two more interviews coming up in the next two weeks.
Any thoughts will help. Thanks :