Conversation so far:
What happened to Ai Kago in 2011?
In 2011, Kazuyuki Ito, president of Mainstream, declared that the agency planned on suing Ai Kago for 100 million yen in damages for contract violations.
Are there any other interesting aspects about Ai Kago in 2011 besides being sued for damages?
Ai Kago was rushed to a nearby hospital after agency officials found her on the floor of her apartment with cuts to her wrists.
Was Ai Kago married?
Ai Kago and Haruhiko Ando registered their marriage.

Question: when did they register?
Self-contained rewrite: When did Ai Kago and Haruhiko Ando register to marriage?