Tradovate offers reduced margins for both the day session as well as the overnight session.
Reduced intraday ("day") margins are currently available from 6:00 PM ET to 4:45 PM ET.
Initial margin is required from 4:45 PM ET until 5:00 PM ET, and if you are holding a position at the close of any market.
A full list of the day, night, and initial margin rates can be found on Tradovate's margins page.