Merrifield Garden Center is hosting several holiday events and classes.  Check their website at https://www.merrifieldgardencenter.com/events/.

For more events, click on  DC Gardens or US Botanic Garden (https://www.usbg.gov/programs-and-events)  or Green Spring Garden (https://www.fairfaxcounty.gov/parks/greenspring/ ) or Meadowlark Botanical Gardens or the Fairfax County Master Gardener's site for events info.