Proponents of the proposed downtown Hyatt convention headquarters hotel just got some powerful ammunition to use in the debate about whether the publicly supported facility is needed. On Thursday, Shriners International announced that it has selected Kansas City to host its 2020 national convention, which is expected to bring 20,000 visitors to Downtown from July 5-9, 2020. The convention is expected to generate 11,000 room nights and pour nearly $18 million into the local economy. The booking...