A new spectrum of online ticket selling options is available to event planners and concert promoters, and a host of smaller Web-based startups are taking advantage of them. For example, Eventbrite offers new tools to help promoters function more like an actual box office, and has started allowing hosts to designate some seats as reserved and charge higher fees for the best seats in the house. Eventbrite CEO Kevin Hartz says the new feature will help the service appeal to a wider variety of event organizers and compete with a growing number of young competitors. Meanwhile, the Sosh mobile app recommends restaurants and activities to users according to their whereabouts and interests, and the company recently began selling tickets to one-off local events in San Francisco. Sosh strives to differentiate itself by selecting only the best events to show to users. “There’s a certain amount of quality that we have to believe in,” says Sosh CEO Rishi Mandal. Although its business model might restrict the number of offered events and the amount of revenue Sosh generates, Mandal also notes it means users may be more likely to trust Sosh for outstanding recommendations.