Multiple "Simple" Events Calendars on Multiple Pages

I have PHPBB with custom pages, accessable by registered members. One extra feature on my website is to be a Locum GP Directory, listing locum GP's (who would pay for this service) linking to the GP's own "profile page" which I can develop no problem. On their profile page, I would like to have an embedded events calendar to show their availability, that the locum GP can add "busy" to when they are not available (can update at any time), but as there may be numerous locum GP's, I would need multiple instances of this calendar for each Locum's profile page so they would no doubt have to have multiple SQL databases so one's events wouldnt appear on anothers calendar.
So the job is to develop a simple calendar to be embedded within these pages that wouldnt clash with data files if multiple calendars were put on multiple pages for each user to edit events on.