As long as they pray before sunrise, pray with them.

I am in a place , where people pray the fajr ( Congregational) prayer at the time when the sky becomes clean I mean its morning already . They do not believe that there is a prayer called Shurooq ,. At this situation what should I need to do ?

Prayer | September 15, 2014 1:34 am
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Is it permissible to pray the eid salah in the mosque or open space within the town, should in case we got no access praying outside the town.? I only know the Prophet salla Allahu alaihi wa sallam prayed it outside town.
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Is it ok to recite Surah Fathiha in sujood as a dua?