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(edited) I am having trouble finding a single word to describe a person who likes to "celebrate". This is different from "party animal", "clubber", "reveller" or "socialite". Specifically, I am looking for a noun that is designated for such a person.
The said person has the personality that simply enjoys being with friends and likes to find occasions to celebrate, in good spirits. In addition, the said person not only goes to party, but s/he takes the initiative to propose having one to celebrate (an event/life/news...etc) whenever s/he finds the opportunity to do so.
Any help? Thanks.