I met with a provider about a month ago.  She was to be in Boston again in Jan.  I have not seen any ads for her recently on Eros, but want to hook up again on her next visit.  Is is acceptable to call her to find out her schedule or jjust wait for her to post her scheduel?

Most of the time, a lady will update her travel schedule on her site.  If it's not there, you could email her to ask.  It's not uncommon for travel plans to change, sometimes with as little as a days notice.  I don't think I'd hold my breath for her return, but dropping her a line isn't a huge deal.

and let her know of your interest.  For all you know she is thinking about where to tour and your suggestion could be the one thing that brings her to you.

I think most gals would prefer an email for this kind of contact.