Allowing visitors to View Outlook Calendar

I am wondering if there is some way that you can allow someone apart from those on your company’s network to view your Outlook Calendar and enable them to book an appointment with you.
This is because I am looking to hire a number of people over this month and would like to book more than twenty calls with interviewees weekly using my Outlook. For convenience purposes I would like these individuals to first view my free times in my Outlook Calendar in that particular week before proposing a time for the interview.
Using email to set an interview time has been tough as it involves a lot of time sending and receiving messages till you agree on a convenient time for both of you.
If there is any program that will enable me to achieve this please let me know.
