Kindly refer to the following links:
Making dua after prayer on your own or in congregation
Gathering people to make collective Dua for something we want permissible?
Salutation on Prophet in Congregation
Congregational dua during Friday Khutbah & After Friday Prayer
Should I leave the masjid if they make Congregational Dua, what if I want to stay for Ishraq?
School forces Congregational Dua - What to do?