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: Tuesday, November 14, at 7:00 a.m. (PST) to Wednesday, November 15, at 6:59 a.m.

Read on for details.