Is it permissible to accept prizes offered in religious competitions held in mosques on occasions such as the month of Ramadan and the Prophet's birthday?

Ramadan competitions that adhere to Islamic guidelines are permissible to participate in and receive prizes from. As for competitions related to the Prophet's Birthday (Mawlid al-Nabawi), it appears that they fall under celebrating it, and celebrating the Prophet's Birthday is not legislated (غير مشروع). Therefore, it is not permissible to participate in them or to receive prizes from them.