On Saturday, September 30, 2017 from 9 am to noon, the City of St. Louis & The National Park Service will co-host The Great MonArch Migration Event at the Gateway Arch, in honor of National Public Lands Day. Join the City of St. Louis, National Park Service and pollinator experts from the Missouri Botanical Garden Butterfly House & Saint Louis Zoo for a special morning of monarch-themed activities at the Jefferson National Expansion Memorial (at the Arch’s Luther Ely Smith Square). Read here to find out more about the St. Louis Mayor’s Office Milkweeds for Monarchs initiative.