Like Paul said They did not celebrate a sabbath There meetings were whenever and where Ever it was needed and practical As Hebrews 10:24,25 indicates - The Jews were upset at the changes made after Pentecost because they believed the law covenant was Still in existence not accepting Jesus as the promise Messiah Even some that became Christians tried to go back to Law covenant and so there was an issue over circumcision As seen in acts 15 In fact Paul spent considerable time in his writings To convince them that they were no longer under the old Law covenant - as also per Daniel 9 -