manaanaa मनाना

I read someone saying about usage of "maatam" in Hindi more as "maatam manaanaa" than "maatam karnaa". I was somewhat surprised by this. For some reason I have always associated "manaanaa" with happy occasions than sad ones, e.g khushi manaanaa, Christmas manaanaa, saal-girah manaanaa etc. Is manaanaa also used for sad occasions?

Yes, "maatam manaanaa" मातम मनाना is used in Hindi and is correct usage. So we can say that "manaanaa" मनाना is used for both happy and sad occasions...

So all of the following are used:

मातम मनाना (maatam manaanaa)

शोक मनाना (shok manaanaa)

जन्मदिन मनाना (janmdin manaanaa)

होली मनाना (Holi manaanaa)