These used to come around 2 or 3 times a year pretty regularly. It looks like this may have stopped. It's not that everything at rebel is a great deal even with the 30-40% off, but there are some items that it's particularly great for.
Any idea if this is done for good?
According to google:
There was one in March.
Last Month (August) saw a storewide 30% off but branded as 30th birthday sale rather than F&F.
2025 saw one in October, so could be one then or in the usual November / December sales period.
I don't think it's ended.