Events - Calendar of Events January 2 Mon Office closed for New Year's holiday. 25 Wed General Membership Meeting, 5:00 pm – 7:30 pm, River House, 509 King William (behind Steves Homestead). February 22 Wed General Membership Meeting, 5:00 pm – 7:30 pm, River House, 509 King William (behind Steves Homestead). April 24-27 Tues-Fri Night in Old San Antonio® - come celebrate San Antonio's diverse cultural heritage with 15 ethnic areas that serve fabulous foods. NIOSA® benefits the education, grants, preservation and museum programs of the Conservation Society. 27 Fri Office closed for Battle of Flowers. May 23 Wed General Membership Meeting, 5:00 pm – 7:30 pm, River House, 509 King William (behind Steves Homestead). 28 Mon Office closed for Memorial Day June 27 Wed General Membership Meeting, 5:00 pm – 7:30 pm, River House, 509 King William (behind Steves Homestead).