(Portland, OR)  --  Portland is only one of a number of cities across the U.S. in which May Day rallies and marches are slated to promote workers' rights.  The event organized for today by the Portland May Day Coalition is being called "Rise Up, Resist and Unite," and is scheduled to begin with a rally at Shemanski Park at two o'clock and a march through downtown starting at three.  Portland Fire & Rescue officials tell Fox-12 medics will be embedded with crowd-control personnel from the Police Bureau, but will wear uniforms that are markedly different from their law-enforcement counterparts.  May Day organizers say they'll have their own street medics and "peacekeepers" on hand to de-escalate any tense situations.