Is reciting 'salat o salam' in mehfil(gathering) allowed in Islam?

There has been much debate among deobandi and baralvi of salat o salam, but both sect belong to Sunni. However there are one sect who say companions of prophet Muhammad(PBUH) use to recall salat o salam. **Question:** is it true and is it permissible to call mehfil(gathering) in which all people gather and read salat o salam and other verses from Qur'an?