There is a tradition of a ceremonial wreath laying at the tombs of deceased presidents on their birthday, a tribute from the current occupant of the White House. The wreath is usually presented by military personnel.
Woodrow Wilson was born December 28, 1856, so this will be the 162nd anniversary of his birth. His second wife, Edith, passed away on his birthday in 1961, so there will be an added tribute to her.
The Wilsons are interred at the National Cathedral in Washington. For details about this year’s wreath laying, see: https://cathedral.org/event/ceremonial-laying-wreath-president-wilsons-tomb-2017-12-28-2018-12-28/?fbclid=IwAR15-bh6LhzgPGVv7ptvWQaYe28IYbSDYF9d6fgoKpSECA8U6gWRY9bWQuk