"To commemorate the anniversary" means to remember and honor a specific event that happened in the past, typically on the same date, in order to recognize its importance or significance. Full definition
Mayor Bill de Blasio said a «very rough night» of little sleep, in addition to fog, kept him from arriving on time to a Wednesday morning memorial service commemorating the anniversary of Flight 587's crash in Belle Harbor, Queens. (observer.com)
Upfor.digital, the online extension of Portland's Upfor Gallery, is proud to help commemorate the anniversary with an online presentation of Detail (s) from GRAMMATRON (Animated GIF Remix). (markamerika.com)
President Donald Trump slightly misquoted one of President Franklin D. Roosevelt's best - known speeches in a tweet commemorating the anniversary of the Pearl Harbor attack. (businessinsider.com)