Some facts about Harvard Square:

 - Home to Harvard University, renowned academic institution with a massive endowment, arguably the hardest college to get into in the U.S., home to many of the most well-respected graduate schools as well.

- On the Red Line of Boston's subway system, easy access from downtown Boston

- Thriving area for shopping, eating, hanging out, people watching, drinking, theater going, etc..

 - Many tourists come to Harvard and find it an excellent place to spend some time.  There is access throughout the University - you can see the statue of John Harvard, the ivy-covered walls of dorms and classroom buildings, peruse the wide variety of shops, picnic by the river and watch the crews row by.

- There is a new addition to tourist offerings - the Unofficial Tours Inc Guide to Harvard is apparently an excellent, irreverant tour of the school by current students.  It starts very close to the main subway stop entrance. There are also student-led tours that are sanctioned by the University that are free and don't ask for a big gratuity at the end, which is the only charge Unofficial Tours solicits.

- If you're looking for lunch in the Square, there's a blog about current lunch offerings from Harvard Square restaurants that might help. 

- There's a  site maintained by the Harvard Square business association that has dates of festivals/events along with a directory and map.  Note that Oktoberfest and the Head of the Charles regatta are not to be missed. 

- There's a site maintained by the Cambridge Office of Tourism  that has more comprehensive info on all of Cambridge and a calendar of events that covers everything from book readings, lectures to festivals and music. Also lists things like bookstores, museums, restaurants, etc for the whole city.  You can also check out the Harvard University Gazette's events calendar for info on lectures and exhibits at the University's many popular museums, including the Harvard Art Museum and the Harvard Museum of Natural History.