In case you wanted to see the printed services used at First Universalist Church, Providence, held over General Assembly, please download this PDF (4.2 Mb). I created this not out of the 1941 edition of A Book of Prayer for the Churches that First Universalist, Providence, uses, but the 1957 edition printed by the recently defunct First Universalist Church, Woonsocket, Rhode Island. (I got it on eBay.) Just to be clear that the tradition isn't a nineteenth-century re-enactment, but long-held. And there's a difference.
But the text for morning prayer and vespers in the two editions is the same. Note: we prayed vespers and not evening prayer. Evening prayer developed from vespers (the evening service) and compline (the service before bed) so that raises the question: why does the book have both? I don't know, except to think that some churches used one and some the other. I'll have to analyze their differences.
A word about how they ran. The pastor of First Universalist, Providence, lead the services making "micro-alterations" and applying local, customary ceremonial. We were supported in our singing and chanting by organ and organist. With readings (Old Testament and Gospel in the morning; New Testament epistle for vespers), sung responses, psalm, a brief address, and a hymn (vespers only) the services ran about 20-25 minutes in the morning and fifteen for vespers.