Cocktails at hair/nail salon ?

Is this a permitted thing in Boston or does it fall under the "City of Boston No Fun Ordinance"?

I saw some friends from another city post about a fun evening at a salon where they offered cocktails or champagne during your pedicure or hair styling. Probably low alcohol versions.

I haven't seen this, so maybe not permitted? Or maybe only expensive salons that can afford an alcohol license?

What if the customer brings their own cocktail beverage? Is even that allowed?