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For me it's 3 stages you clear only once being planned as only content for 2 weeks during the anni.
Oh nevermind, there are also the event story reruns without FFB and an experimental 3* gear "event" to tease the future gear farming that was made even easier, as in you just trade 2* gear in the shop. Very cool!
It's like that time they ran out of ideas and did that Flying type solo event weak to Electric type, it gave nothing interesting and was clearly a test for the units bonus score system or whatever, didn't even have a story, it was very random.