In the Acts of the Apostles we find that the early believers were every day visiting the temple and afterwards meeting in each others homes.
Every day they continued to meet together in the temple courts. They broke bread in their homes and ate together with glad and sincere hearts, praising God and enjoying the favor of all the people. And the Lord added to their number daily those who were being saved. (Acts 2:46-47, NIV)
If the Old ceremonial ways of the Old Testament were finished at the death of Christ (or as other conjecture after Pentecost) why did the church still attend temple gatherings? Was it because they were not fully aware of the full implication of the New Covenant and may have even offered sacrifices? Was it because they just wanted to get together and evangelize their brethren? Was it some mishmash of both reasons plus possibly more? What was going on in their heads?