Here's what was found last Saturday at the USA Science and Engineering Festival:
461.5125 [ d152] CSC Event Staff (S)
The RadioReference Wiki page for convention center events groups has the groups that were active for organizers. Several of the regular groups on the system were also active. The convention center leases radio channels to select events at the center. With a six-frequency, twelve-talkpath Capacity Plus system, they have plenty of room on their system to do so.