Planning for a budget wedding has a growing number of Millennials using Airbnb to find the right venue, and soon enough the site will serve as a full-service concierge, offering anything from event tickets to dinner reservations. For this generation, planning their social lives has become more fragmented thanks to single-purpose social media and ticketing sites, so the expansion for Airbnb past housing and into areas of entertainment could be a smart move. (brand-e)