Website Booking Calendar
Simplybook.me Booking Calendar Setup and Link to schedule appointments. This Calendar will sync to your Google Calendar. You can use it to book events, courses, appointments, and create categories for various services, employees, time slots, intervals. It's free for up to a 100 bookings a month. Note, if you want to use the free version they force you to manually renew (for free) every month. It's not a big deal but you have to keep an eye out for the email.
See it in action at awake.simplybook.me