The events are still playable. Go to the store and at the far left tab click the FOF section. You can purchase/unlock the Gauntlet and season mode events to obtain the players needed for the 80-84 OVR FOF player sets still. The price to unlock each event is 4K gems.
FOF blitz event is still going on in the Madden Today event map as well, which awards free 70+ players for each win.