I started using Google Calendars for my classes at the end of 2015, and in 2016 I took it up a notch and embedded them into my virtual classrooms so they were easily accessible with the rest of my resources.

I have one for each class, as well as the clubs and groups I'm involved in, and students can subscribe so important dates are downloaded to their personal devices, and they can even set reminders. It's great for keeping them on track, but it's also great for me to see all the important dates in one place. It's also fantastic for parents, as they can subscribe and keep abreast of due dates and important school/class info to help support their children in keeping on top of schoolwork and assignments.