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MB3 122a What Defines a Tent Regarding Shabbos? (315:1)
The prohibition against making a temporary structure on Shabbos only applies to the roof, unless it would change an area's halachic status (e.g. sukkah). Making a "chuppah" for Chatan Torah. Walls without a roof are not considered an ohel. Hanging tapestries on a wall on Shabbos. Extending/adding onto a temporary tent on Shabbos.