Walnut Councilwoman Mary Su calls emergency press conference at 1 p.m. Posted on March 19, 2014 by Richard Irwin Walnut City Councilwoman Mary Su has called an “emergency” press conference today at 1 p.m. in her campaign headquarters at 358 N. Lemon Ave., in Walnut. Su said she will discuss stealing cards, defamatory talk of the town and other issues.