centennial

centenary

centurial

centenary century hundredth

centuplicate

annual intermittent monthly occasional recurrent recurring regular repeated routine seasonal sporadic weekly yearly

periodical

alternate at various times cyclic cyclical daily epochal every once in a while every so often fluctuating hourly infrequent isochronal isochronous on certain occasions on-again-off-again orbital perennial rhythmic serial spasmodic

constant infrequent unusual

continual irregular lasting permanent sporadic variable

bazaar celebration display exhibit festival gala market pageant show

exhibition expo fete observance occasion spectacle