That's not how season 5's extended rewards worked. It had something for a narrower weekend event, but everything else (doffs for hitting certain commendation levels, various bonuses for leveling up) wasn't time limited. They took a snapshot of the database a day or two before the patch went to holodeck to check for eligibility.
ah ok. I came after F2P (during the second anniversary actually) So I don't really know how those worked. only ever qualified for the tribbles.