In a news release, Department of Public Information Special Projects Coordinator Mike Brothers directs those who wish to attend the meeting:
"Those attending the Commission meeting should enter the Busch Building through the main doors on the east side of the building. Security will remain the same as with Commission meetings in City Hall. Visitors will need to check in with security in order to gain access to the elevator to the fourth floor."
Though I did not note the news release specifically indicating the meeting will be in the 4th floor conference room, since there is an indication attendees will need to access the elevator to the fourth floor, it's probably safe to assume the meeting will be held in the fourth floor conference room at the Busch building.