Albert Bloomfield has a large cache of these Vespers materials. There are many ways to get in touch with him, but the easiest is
https://asbloomf.github.io/
I have a small suggestion: invite specific people. They will invite other people.
I suppose that runs about 45 minutes to an hour? Is it before or after an evening mass?
Both the Church and the world changed to destroy this pattern; the church because the relaxation of the Eucharistic Fast made it possible to celebrate Mass later in the day, and congregations were larger than for Vespers; the world, because 70 years ago shops were closed all Sunday, pubs and bars were closed from 2pm to 7pm, TV stations did not broadcast on Sunday afternoon, and most housholds owned no motor vehicle. By the start of Vatican II, Vespers had largely been displaced, and secular counter-attractions were multiplying rapidly.SUNDAYS : 8, Low Mass; 9, ditto; 11, High Mass and Sermon.
AFTERNOON : 3, Catechism. EVENING : 6, Complin, Benediction, and Instruction.
Or allow participation in public Sunday Vespers to satisfy one's preceptual obligation of Sunday worship....
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