The Brethren churches where I as a member years ago, worship in this fashion. They have elders, and the services are completely open. One elder opens in prayer and from then on, it is left to the Spirit of God to direct. Some elders lead a hymn, some pray, some teach from the Scriptures, the worship is ended with the Lord's Table. It is all done in an orderly fashion. The women kept silent and only joined in on the singing. This type of worship can be quite refreshing, though there was a downside, particularly that we never had any expository preaching, and after a year of this, I could tell that I wasn't getting "fed" properly. Also, I personally believe, because of the lack of sound teaching, there were many in the church who did not really have a grasp or understanding of their faith apart from the traditions of the church.

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J Baldwin
Keowee Presbyterian Church, PCA
Pickens, SC
“You shall love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind, and your neighbor as yourself.” Luke 10:27

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