There is only lucky gacha draw on Himeuta .I only check the date and time people drawing. There were some date people draw 3-5 rainbows, usually on last first day or last day of month. Many good luck draw are also in evening till morning Japanese time. People also advice using 100 dmm draw and silver pot from normal draw for higher chance.
There is no way time coincides with Nutaku (Nutaku based in Canada so they use different time). Over all these are only my speculation just dont rely on it.
By the way, there are some posts saying you can get free dmm point on occasion, but i cant figure out how (guess i have to registered and ask from that side).
IGN: Dorei sama
ID: 3793935
FKG ID: 647602170
Finally catching up to Wutan..
IGN: Rupturez
ID: 618437322
DMM Server.
DMM FKG ID: 986648592
Name: Wutan