If your talking about Twitch drops, they sometimes overlap with an event but I don't recall them being event specific campaigns. In any case there are no ESO twitch drop campaigns currently.
If you mean in game drops then you have to be in PVP zones which have boss drops in Imperial City and Extra resource drops in Cyro.
Do you mean Twitch drops? Those are only at specified times. If an event is going on, there might be Twitch drops for a period of time during the event, such as on a weekend, but not for the entirety of the event.
Twitch doesn't have any drops campaigns listed for ESO right now, but it's possible-- although not certain-- that there might be a drops campaign during one of the two weekends during this event.