For the second time in 16 years, Newbury Street will be closed to traffic as Boston celebrates Fashion's Night Out. The fourth annual event begin today at 6 p.m. at the center stage up at Exeter and Newbury streets. Here's a quick guide to tonight's party:

• See Patch blogger Donna Rheaume's fantastic, comprehensive preview of the evening, including tips on the best places to be.
• Check out what The Pruduential shops have in store tonight, including special sales. 
• Copley Place will play host to an evening of high end fashion shows from 6 to 9 p.m. This event is free to all.
• Have one of Sweet's Fashion's Night Out special cupcakes. 
• See photos of Fashion's Night Out last year. 

Other things to know about Fashion's Night Out:

• More than 100 retailers in the Back Bay will offer cocktails, giveaways, makeup consultations, gifts with purchase, parties, samples and much more.  
• Nineteen countries will take part in today's celebration. 
• Herb Chambers will display up to 80 luxury cars along Newbury Street, including cars from his personal collection: a Bugatti Veyron, a Ferrari Daytona Spyder and a McLaren F1.
• The work of Boston artists will be on display. 
• The event will feature Boston designers, including Britt Eldridge, the owner of Britt Ryan on Newbury Street.