I think you can just show up. Unfortunately most meetings like this don't have particularly good attendance so I don't think that over capacity is a problem.
This is the complete text of the email.
"Dear Friend of PGCPS:
I'm sorry the weather prevented us from meeting on Tuesday evening to discuss our critical budget situation at the state and local levels. Our session has been rescheduled for Thursday, March 5, 2015 - 6:30 p.m. at Kenmoor Middle School, 2500 Kenmoor Drive, Landover, MD 20785.
I hope you can make it. Working together, we can mobilize to adequately fund education in Prince George's County.
I look forward to seeing you on March 5th. As always, if you have any questions don't hesitate to send me an e-mail at ceo@pgcps.org.
Thank you.
Kevin M. Maxwell, Ph.D.
Chief Executive Officer
Prince George's County Public Schools "