Please, take my advice and move this question to "Southern Italy". This is the part to make announcements not to ask questions. Nobody looks here for questions. I promise that in the section "Southern Italy" more people will read your questions.
Since a couple of weeks the Civil State of San Gregorio (and other towns in te province of Reggio is online. You will find it here: www.antenati.san.benic...+Calabria/
At first you wil have to choose which period you want: the napoleontic period goes from 1809 till 1815, the period of the restauration is from 1816 till 1865 and the stato civile italiano from 1866 until ca. 1920. After that you can choose the town San Gregorio.
If you need help before 1813 you can ask me concrete questions and I will look for in the churchregisters