Calendars can be a great classroom resource and inspiration for research.
Student activities can be as simple as working out how old the person whose birthday is marked on the calendar "is", or looking for websites that are celebrating the day, the month or the year. Many of those sites have an educational focus and special activities for students.
Students will often get a real kick out of finding out who shares their birthday or if any significant events have happened on that calendar date. Once they have located some basic information they can research to find out more and present it to the rest of the class. Extended research could be turned into a powerpoint presentation or an e-book. They could create an online e-book at issuu.com
Another interesting source of information are the Google logos. You have probably noticed these occasionally when you use a Google search. The Google doodlers have become more adventurous over time and the logos more interesting.
For example today, Feb 8, the Google logo celebrates Jules Verne's birthday in 1828. Classroom research might start with how old he would be, but then get on to why we want to remember him. The library might have a copy of one of his books or you might find a movie based on it. If you have e-readers, then the Gutenberg Project may help you out. Around the World in 80 Days is here. You could create an e-book using ereadups.com or simply search Wikipedia or similar to find out what has been named after Jules Verne. Classroom discussion could centre around the role of visionary authors in pointing us to what might be possible.
So why not get started today? Print a calendar or two out. Festoon your classroom or your library with them, and start celebrating!