Las Vegas Sun Currently: 42° —Sam Morris/Las Vegas News BureauDisplays fill the parking lot during the World of Concrete show Tuesday, February 4, 2020, at the Las Vegas Convention Center. By () The coronavirus pandemic brought Las Vegas conventions to a jarring stop last year, but tourism officials hope trade shows gradually return in 2021. The World of Concrete gathering in June will likely be a good measuring stick for a comeback, said Steve Hill, president and CEO of the Las Vegas Convention and Visitors Authority. It is also the first large-scale trade show planned for the Las...…Las Vegas Sun Currently: 42° —Sam Morris/Las Vegas News BureauDisplays fill the parking lot during the World of Concrete show Tuesday, February 4, 2020, at the Las Vegas Convention Center. By () The coronavirus pandemic brought Las Vegas conventions to a jarring stop last year, but tourism officials hope trade shows gradually return in 2021. The World of Concrete gathering in June will likely be a good measuring stick for a comeback, said Steve Hill, president and CEO of the Las Vegas Convention and Visitors Authority. It is also the first large-scale trade show planned for the Las...WW…