I posted a question but got no reply.
What is going on?
When had you posted your original question?
FormsCentral doesn't really offer any sort of fillable calendar, assuming I understand your question correctly, a Calendar which you could fill with events and appointments...
Here are some resources to learn about FormsCentral to see if we offer what you are looking for:
Video overview of FormsCentral: https://www.acrobat.com/formscentral/en/video-index/formscentral-overview.html
A collection of quick start guides and tutorials: https://www.acrobat.com/formscentral/en/library/how-to-make-create-survey-or-form.html
Feel free to describe your need in more detail and I will be able to answer better.