Have you heard of or tried the Boomerang Gmail extension? It is a great extension. Did you know that Boomerang can help you keep track of messages or reminders that you don't need right now, but certainly need reminders so you can do something with it later?
For example, if you are going on a trip, Boomerang can bring all your flight itinerary and hotel information to the top of your Gmail inbox the day you leave for your trip. Have you composed an email you want to send to students but want to wait a couple of days to send it to them? With Boomerang, you can set the date and time for your email to show up in a student's inbox. Boomerang can also keep track of important dates for deadlines and all that end of the school year stuff that needs submitted. Make sure your important deadlines don't get overlooked. Check out Boomerang.