JUNA EVENT CALENDAR is very easily used plugin calendar, which has lots of advantages.
Juna IT Easy Calendar - Easy to use for anybody, Easy Calendar provides enormous flexibility for designers and developers needing a custom calendar.
A calendar system with many views, upcoming events widget, color-coded categories, recurrence, and import/export of .ics feeds.
Webba Booking is a powerful and easy to use appointment booking plugin. Fully responsive, multi-service and flexible.