Conversation so far:
Did Sugizo release any singles in 2010-2011?
Yes
What was the name of one of the singles Sugizo released in 2010 to 2011?
Fatima, Do-Funk Dance, and Prana
Did Sugizo release any other singles between 2010 to 2011 besides Fatima, Do-Funk Dance, and Prana?
Dear Spiritual Life“
Was any of the singles Sugizo released in 2010 to 2011 top charters?
Prana, topped the iTunes electronic charts
Did Sugizo produce any songs?
Yes
How long did the stage play Nemuri Kyoshiro Buraihikae last?
Nemuri Kyoshiro Buraihikae, featuring Gackt in the main role, which ran for 120 performances across Japan
Did Sugizo perform during 2010 to 2011?
Yes, he performed at the Nagisa Music Festival

Question: When was the event?
Self-contained rewrite: When was the Soul's Mate Day IV event?