This is what is known as the Great Commission. In the original language, these words are a command. That is why we call this the Great Commission and not the Great Suggestion. And I believe that to fail to do this actually could be a sin.
Jesus’ followers were gathered together for Pentecost, and the Holy Spirit “filled the whole house where they were sitting” (Acts 2:2). “All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them” (Acts 2:4).
In some Christian traditions, the church elder is an appointed person who usually serves a local church or churches and who has been ordained to a ministry of word, sacrament, and order, fulfilling the preaching and pastoral duties.
For the rest of our lives we are to be seeking to know more completely and more deeply all that God did in that six hour period of time when Christ was crucified, and we were with Him by the grace of God.