I'm going to be in POP during that time (June 10-24). If you can tell me where you'll be staying I'll ask my boyfriend who lives in POP to find out for you or recommend something close to where you'll be staying? For actual dancing (not lessons), I usually go to Rancho Tipico. They have live bands that play a mix of bachata and meringue...
You mean lesson. And walk into any colmado and you'll pick someone to show you how better than any expat will, and you'll get it within a few minutes.
There is not a great deal to Bachata, if you haven't got it within a couple of hours, are able to start freestyling it a bit yourself you probably never will get any dance.
The basics really don't get any easier than Bachata.