To navigate to Options, go to ACP → Setup → Options → [TH] Holidays.

Enable automatic holiday selection - If this is selected, the correct holiday styling will be attempted to apply to your site. If this is not selected, the Current holiday option needs to have a holiday chosen.

Current holiday - Choose the holiday you would like styling for to appear on your site. If you set this while having the option above enabled it will likely be overwritten.

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