Is it permissible for women to perform the Ishaa and Tarawih prayers in the uncovered courtyard of the mosque, which is surrounded by curtains that shield them from men? Is there anything that prevents a woman from praying in a place that has no roof?

It is valid for women to perform the 'Isha and Tarawih prayers in the mosque courtyard if it is possible to follow the Imam by seeing or hearing him. There is no statement from the scholars deeming it impermissible for women to pray in an uncovered area, or that their prayers would be invalidated thereby.