noun
commemoration (of a past event), yearly celebration, wedding anniversary, birthday, birth date, holiday, saint's day, yearly observance of an event,
feast day, ceremony, memorable date, day of annual celebration, celebration
of a date, natal day, annual meeting, biennial,
triennial, quadrennial, quinquennial, sextennial, septennial,
octennial, novennial, decennial, silver anniversary, golden
anniversary, diamond jubilee, yearly commemoration, jubilee,
festival, fiesta, centenary, centennial, sesquicentennial,
bicentenary, bicentennial, tercentenary, tricentennial,
red-letter day*.
