Is it permissible to donate for the construction of a hall for weddings and celebrations in a mosque in a city where there are (other) mosques, or is it more befitting to send the money to the needy in our home countries?

It is permissible to allocate a hall within the mosque project for weddings and celebrations, provided that: the land is not endowed for the mosque, and the celebrations adhere to Islamic regulations. It is better for charity to be given to the needy in the donor's country and elsewhere, especially in cases of necessity.