Are you fond of carnival?
Is carnival your cup of tea?
Are you into carnival?
Are you a carnival person?
Are you excited about Carnival?
Are you raring to go to Carnival balls (or to carnival parades, etc etc...)?
Do you get crazy for carnival?
Are you crazy for carnival?
Carnival is your thing? Or is carnival your thing?
(the first is more on the informal/colloquial and conversational side)
And other ways.