Mexico City New Years 2019

Hello! I'm headed to Mexico City for the second time, but this will be my first time there over the holidays. I know that lots of restaurants are closed or open during specific hours, which I've looked into, but I'm wondering about street vendors and market vendors. I realized that it's difficult to predict who will be open, but will a fair share of them be? If we don't have a reservation on New Years, will there be street vendors out selling good around the celebration on Reforma, or will they mostly be home with families? Any info about vendors on NYE or around the holidays would be great!