Remember how Twitter is quietly testing timeline boxes that show trending TV shows? That's not a one-off experiment: TechCrunch has also discovered a similar test for live events happening nearby. Instead of focusing on a person or series, the new box highlights a representative event tweet and offers a shortcut to more tweets associated with that event's hashtag. As before, Twitter isn't directly confirming the existence of its latest trial run; it will only say that it practices "innovation through experimentation." Given the widened scope of the company's testing, however, there's a real chance that these context-sensitive cards could soon become ubiquitous.