One of the better private schools in Siena that provide courses to people that want to learn Italian for a very reasonable price. Look on their website for more information.
Climb the "Torre del Mangia", the tall bell tower overlooking the Piazza del Campo. There is an entrance fee 8 Euro, and only 25 people are let in at a time, so there may be a wait. Not for the faint of heart or claustrophobic, it's about a 300 step hike and you are obliged to leave bags and purses in a locker at the ticket desk inside the tower itself. The panoramic view is exhilarating and well worth the climb. Note that excellent views of the city are also available from the 'Panoramio' by the cathedral, entry to which is purchased as part of the cathedral museum ticket.
Local life in the evening typically revolves around the Passeggio, the nightly walk through town, which often includes some gelato, macedonia di frutta con gelato, or/and drinks at one end or the other. So do as the locals do and enjoy a walk through this beautiful city.
Tourist information is located in the Piazza del Campo.
Siena Jazz Festival
(http://www.sienajazz.it/en) during summer.
Palio Horse Race
(http://www.ilpalio.org/pa...) - a horse race like nowhere else, between the 17 contrade of siena, is run in the campo of siena on july 2 and august 16. all sienese are affiliated with one of the contrade, to which a typical sienese feels loyal with a strength perhaps surpassed only by their loyalty to their family. since the 11th century, the sienese have conducted festivals every year where the contrade compete for renown and in times gone by, actual political power through contests such as flag throwing, horse racing and even fist fights. the fist fights no longer happen a heavy police presence in the weeks prior to the contest sees to that, but the spirit of competition between contrade is still fierce. the race itself is in late evening but the whole day of the race is taken up with processions through the streets of the various contrade competing in the particular race only ten can compete at any time for safety reasons.
During the summer at the accademia musicale chigiana, and at various locations in the city during the settimana musicale senese. (http://www.chigiana.it/fo...)
(http://www.monaciano.com/...) updated list of expositions, market exhibitions, festivals and other events.