That's very interesting, Chris. And the Westminster Directory of Publick Worship, (even though it is a directory for public worship ! -- it also includes things that are not worship, like visitation of the sick) is is referred to as the solemnization of marriage. Yet it still involves elements of worship (e.g, the word and prayer), so it appears (to me) to be a distinction w/o a difference. However, I am not under the WDoPW as a confessional document, but the ARP directory as cited above.
Another issue would seem to arise from this. If it is not Christian worship, then why have the ceremony in a Christian church? What is Dr. Pipa's view on that, if I may ask w/o getting us too
?
I can't (nor would I presume) to speak for Dr. Pipa and please confirm with him before quoting me, but, I think if I recall the very interesting class discussion (which admittedly, I don't have a perfect memory of) that he indicated that a worship service would be uniquely tied to the call of ordained elders for Worship on the Lord's Day (the votum). He would never, I think, for example, advocate a wedding service to take place on the Lord's Day. Again, if memory serves there is division on this question in Reformed circles (some Puritans agree with Dr. Pipa but I think, if memory serves, Terry Johnson disagrees vis a vis the original question of does the RPW apply to weddings).
I may have misunderstood you, but, my own view, biblically, as I think you'd agree, is that the church building is just a building (Acts 19:9) and so the fact that anything takes place on another day does not mean anything
per se. As we would also agree, marriage is not a sacrament and so it does not need to take place in a worship service. We accept weddings conducted in civil courts before a Justice of the Peace as valid as I think you would too. So the only reason I could see, confessionally, for making a wedding a worship service is that vows would be exchanged. However, I see no reason for vows before God to be required to take place in a worship service. The terminology in the WCF 21.5 is "religious oaths, and vows" (interestingly not in the LBCF) which would obviously include ordination but no direct mention of wedding vows are made. The difficulty is the comma but the context seems to be entirely focused on religious vows for service in the Church (cf. prohibition on monastic vows which follows).
One might also argue that many would see wedding vows as being made "in the presence of God" but "to each other" and the WCF/LBCF specifically forbids this (WCF 22.5/LBCF 21.5) reserving vows for God alone (WCF 22.6 "It [a vow] is not to be made to any creature, but to God alone.") Ergo, it may mean that wedding vows are not in view confessionally when it speaks about vows/oaths.
To me none of this reduces the solemnity nor importance of the wedding ceremony. If anything this view that the RPW doesn't apply to weddings elevates the place and importance of corporate worship on the Lord's Day. Nevertheless, I don't think this changes anything too much as there is no sacred/secular division. All of life is to be done to the Lord (1 Cor. 10:31) ergo a wedding's location does not matter unless there is a sacrament being performed. I would agree that it is more meaningful to take oaths before the presence of God's congregation especially if you expect them to be witness to your life and growth in the body of Christ. I also would say that because a meeting takes place under the authority of God's appointed servant that a certain amount of respect and decorum ought to be shown, but, I don't think this precludes the use of wedding rings or other tasteful decorations in the church but that there is some liberty in this. The challenging thing in all of this is that as far as I can tell Scripture is silent on weddings and their relation to worship. I don't think there's any instruction in the NT on it except as regarding who may be "yoked" and there is very little prescription on it anywhere in Scripture.
OK, so that was a bit off topic. We can discuss this further in PM's if you like.
Blessings,