Commemoration

Noun

 * 1) The act of commemorating; an observance or celebration designed to honor the memory of some person or event.
 * 2) Whatever serves the purpose of commemorating; a memorial.

Thesaurus
anniversaries, anniversary, annual holiday, bicentenary, bicentennial, biennial, birthday, bissextile day, celebrating, celebration, centenary, centennial, ceremony, decennial, diamond jubilee, dressing ship, fanfare, fanfaronade, favor, festivity, flourish of trumpets, golden wedding anniversary, holiday, holy days, immovable feast, jubilee, keepsake, leap year, marking the occasion, memento, memento mori, memorabilia, memorial, memorialization, memorials, memories, memory, name day, natal day, observance, octennial, ovation, quadrennial, quasquicentennial, quincentenary, quincentennial, quinquennial, rejoicing, relic, religious rites, remembrance, remembrancer, revel, rite, ritual observance, salute, salvo, septennial, sesquicentennial, sextennial, silver wedding anniversary, solemn observance, solemnization, souvenir, tercentenary, tercentennial, testimonial, testimonial banquet, testimonial dinner, toast, token, token of remembrance, tribute, tricennial, triennial, triumph, trophy, wedding anniversary