Kelsey’s viewOrganizers feared a subdued annual gathering for Abu Dhabi’s seven-year-old entrepreneurial center Hub71; the vibe at the event this week was anything but. There were hundreds of attendees — entrepreneurs, investors, academics, and corporates — noshing on handouts of poke bowls and mango popsicles, with one founder wearing a T-shirt indicating he was fundraising and also “accepting free shawarma.”Hub71, backed by sovereign wealth fu…