baltimore grand prix ticketflyTicketfly, a startup hoping to challenge Ticketmaster with its social media savvy, said it has had a good year — and it’s capping the year off with a new partner, the Baltimore Grand Prix.

The grand prix is a big IndyCar race, and it’s projected to draw more than 150,000 visitors over the 2011 Labor Day weekend. Beyond the pure numbers, the deal is significant for Ticketfly because it marks the company’s first big partner outside the concert industry.

“Ticketfly has had a lot of success in large-scale, outdoor music festivals, so now it’s time for us to continue our growth into new segments and to apply our skill set to those segments,” Ticketfly chief executive Andrew Dreskin said in a press release.

The San Francisco startup was founded by Dreskin and Dan Teree, who previously led TicketWeb, which was acquired by Ticketmaster. They said they saw an opening for a service that not only sold tickets, but also helped concert promoters create a presence on sites like Facebook and Twitter. The company says it now serves more than 100 venues and is on-track to sell 1.2 million tickets this year,

Ticketfly raised $3 million from High Peaks Venture Partners, Contour Venture Partners, The NYC Seed Fund, and angel investors including Howard Lindzon and Roger Ehrenberg.