API scripts - online calenders aggregated

We need someone to create one view where the calenders from 15 different chropractors are aggregetaed- Today the chiropractors use their own systems and we need our calender to show all availible times, The way we see it is that we create a new user for each and one of the existing calenders (in order to be anble to see all availible times in each calender) and then create a webpage whith our own calender where all the availible times are seen. I have skype and i am availible to talk there in order to describe the task in detail. There are today 5 different onlinebooking systems and about 15 calenders (one for each chiropractor)