Can we hold Friday prayers in the musalla?

Every part of the earth that is valid for performing prayer, is a mosque for the Prophet (peace and blessings be upon him) said: “The earth has been made for me (and for my followers) a place for praying and a thing to perform dry ablution” [recorded by Al-Bukhari].

The masjid [mosque] is a place which has been devoted for prayer. A musalla (area allocated for prayer), on the other hand, is a place where prayers and supplications are made and does not have to be endowed for prayers but could be so among other things.Therefore, every masjid is a musalla but not every musalla is a masjid. The masjid differs from the musalla in the following aspects:

1- The masjid is a place that has been endowed for prayer and therefore cannot be sold or disposed of in any manner. Al-Imam Al-Nawawi said: “When an endowment is made, the ownership of the article belongs to God” [Minhaj Al-Talibeen]. However, a musalla can be sold, or transferred to another place as it may likewise be a rented place.
2- A menstruating woman and a ritually impure person are prohibited from staying in the masjid whereas they are allowed to stay in the musalla. Al-Imam Al-Nawawi said: “What is prohibited in a state of minor impurity (which requires ablution) is definitely prohibited in a state of major impurity (which requires the purificatory bath) i.e. these people are allowed to pass through the masjid, but they are not allowed to remain in it” [Minhaj Al-Talibeen].
And God the Almighty knows best.