commemoration (n.)

• anniversary
• bicentenary
• bicentennial
• biennial
• birthday
• celebration
• centenary
• centennial
• ceremony
• fanfare
• favor
• festivity
• holiday
• jubilee
• keepsake
• memento
• memorabilia
• memorial
• memorialization
• memory
• observance
• ovation
• quincentenary
• quincentennial
• rejoicing
• relic
• remembrance
• revel
• rite
• salute
• salvo
• sesquicentennial
• solemnization
• souvenir
• tercentenary
• tercentennial
• testimonial
• toast
• token
• tribute
• triennial
• triumph
• trophy