What does 'algunas' mean? if it here it is in a sentence: algunas fiestas se celebran en la case de la familia. who ever answers this will get a , brainiest answer and 20 points

"algunas" is formed with "algun+a+s"
where the "a" is the feminine and the "s" is plural.

Algun means "some": algun pais: some country, algun amigo: some friend

so algunas means some for femininine plural: some parties.

party, Fiesta is feminine in spanish, so you need a feminine version of algun.

and the sentence means: some parties are celebrated in the house (casa not case!) of the family

well, in this context, fiesta can also be a "celebration" or "holiday", not only a party

so it means "some unspecified ones"

Algunas means some  the sentence says Some parties are celebrated in my family house.

More info for

The answer is el saco de dormir , because you need a sleeping bag to camp