When it comes to duchaning, see the RMA O”CH 128:44 saying that we only duchan on Yom Tov because we are besimcha whereas on Shabbos we worry about our weekly needs.
Talis, see the MB siman 17 sk 10 why bochurim don’t put on a talis.
There is minhag in Frankfurt to cover the Choson and Kala with a talis under the Chupah.
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