1) Affair 2) Cheerful 3) Festive 4) Function 5) Happy 6) Jolly 7) Jovial 8) Joyful 9) Merry 10) Occasion 11) Social function 12) Social occasion 13) Used for celebrating 1) Festal 2) Festive 3) Gala 4) Jubilant 5) Memorial 6) Successful 7) Wedding 
[adj] - used for celebrating
celebratory 1. A reference to honoring (as a holiday) especially by solemn ceremonies or by refraining from ordinary business. 2. Descriptive of marking (as an anniversary) by festivities or other deviation from routine activities. 3. Used for celebrating.
adjective used for celebrating