The 15th of each month is "Let's Go! Vana'diel Day!"

For 24 hours only, Vana'diel will undergo a couple small changes in celebration of FINAL FANTASY XI's 15th anniversary.

Event Period: Thursday, September 14, at 8:00 a.m. (PDT) to Friday, September 15, at 7:59 a.m.

Read on for details.