You could have a different issue type or project with a different workflow assigned to it. Then you can use something like the Automation add-on https://marketplace.atlassian.com/plugins/com.atlassian.plugin.automation.jira-automation-plugin to move issues into that workflow when the time period starts, and back out when it ends.
We're looking for participants for a workshop at Atlassian! We need Jira admins who have interesting custom workflows, issue views, or boards. Think you have a story to sha...
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