Dear Confused,

I want first to say there is no such thing as a silly question only silly when we do not ask the question. Communion or also called the Lord’s supper is an ordinance given to Christian to follow reminding us what Jesus did for us at Calvary. Remember just like water baptism is an ordinance given by Jesus they do not save us. Only believing in Jesus Christ does that.   It is a time of celebration and remembrance when we eat of the bread and drink of the cup. We are to remember and but worth to how Jesus gave Himself completely to give us and all humanity a better life, and new start. I do not believe Jesus is so concerned about the method of partaking of the bead which represents His body or drinking of the cup which is symbolizes His blood, but that during this time of communion with Him and other that we celebrate His victory for us. 

1 Corinthians 11:23-26  "For I received from the Lord that which I also delivered to you: that the Lord Jesus on the same night in which He was betrayed took bread; and when He had given thanks, He broke it and said, 'Take, eat; this is My body which is broken for you; do this in remembrance of Me.'  In the same manner He also took the cup after supper, saying, 'This cup is the new covenant in My blood. This do, as often as you drink it, in remembrance of Me.'  For as often as you eat this bread and drink this cup, you proclaim the Lord's death till He comes. Jesus was broken for us so that we can be made whole by Him."

As often means this is not restricted to any time frame! So to answer your question, different fellowships select a certain time so all can celebrate together. Some fellowships do communion every Sunday. That is up to the Pastor of the fellowship. But we can take part in the celebration of the Lord’s supper by ourselves at home, in a home group, or other places.  But as often as we partake we are to remember it is all about Jesus, we should celebrate and be so thankful to Jesus. He provides all we need both physically and spiritually.