usually before you start playing the party event map, you click my info, my stats, map stats and check what is the time you played that map so far. write that time down or take a screenshot. then you play that party event map until the time played is 2 hours more than it was before (or 1 hour if event is to play for 1 hour).
My Event: click this
if you're not single =^.^= ElumineLily, 25thNight, BlaZcoWicZ, 25thBaam, iNyuuBlaZ, RWBY, Yoredet, KIRITOxASUNA, ShiWoonYi, NiTianErXing