Come and see the works of God;
He is awesome in His doing toward the sons of men.  -Psalm 66:5

Come is a 2 fold invitation.  First - if you've never met God, you need to come meet Him for the first time. Second - once you've come to Him, then you need to daily renew your relationship with Him.

The biggest invitation to come: Come meet God for the first time!

Your spiritual journey starts when you meet God.  God wants you to come to Him.

After you've met God the first time, the next invitation to come is to: Come Meet with God and His People Regularly

Christianity isn't a once and done thing.  It's a relationship with the Creator of the universe - Jesus Christ!  Unfortunately, as long as we're on this earth, we're still prone to sin.  Often this is a result of us getting too focused on ourselves and not enough focused on God.  The second part of the invitation to come is an invitation to personally meet God daily and to weekly meet God corporately with the church as the church helps strengthen your relationship with God and you help strengthen others in the church in their relationship with God.