Yes, the orchid repotting event will be held on Saturday, April 27 from 9a-12p. You may come at any time during the event and orchid volunteers will be there to help repot orchids and give advice.
April 27th per page 41 of the parks & recs activities book. 9 a.m. to 12 p.m. https://www.facebook.com/washingtonpark.botanicalgarden/
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