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Thank you!
Hi,
Although you can set non-working days or holidays to prevent tasks from ending on certain days, there isn't a way to lock dates such that tasks can't be scheduled to start on specific days. I'll pass your feedback along to our Product team for a way to lock dates in this manner.
If needed, details on setting Non-Working days/holidays in Smartsheet are available in our Help Center: https://help.smartsheet.com/articles/516392-defining-working-non-working-holidays-on-a-project-sheet