Atlantic City’s convention business has been receiving a healthy boost through the first six months of 2015 as the city tries to attract more corporate business in order to offset a series of casino closings last year. The number of convention-related hotel bookings jumped 37 percent through the first half of this year, according to Meet AC, the private, non-profit organization promoting the city as a corporate-meetings destination. More than 118,000 hotel room nights have been booked so far this year for conventions through 2022, compared to about 86,000 during the same period last year. The number of conventions, trade shows and smaller events booked from 2015 to 2020 also jumped 40 percent, with 118 signed up through the first half of 2015 compared to 84 during the same period last year. To encourage more corporate business, a new $126 million conference center is scheduled to open in August at Harrah’s Resort.