Early Shabbat
Question
How early are we permitted to take in Shabbat in Jerusalem? We have friends visiting from America in late June and they want the children to take part in the Shabbat meal and not be too tired, so we would like to take in Shabbat as early as permitted. Also do most shuls offer an early minyan for this? Thank you. (We recently moved to Jerusalem and do not know the laws on this subject.)