Now let me see;

Christmas 2010 = 3
Dream Hat, Dream Suit, Dream Boots

New Years 10/12 = 3
Usagi Kabuto, Red Usagi Kabuto, BlackUsagi Kabuto,

Easter 2011 = 5
Pristine Egg Cap, Brilliant Egg Cap, Vibrant Egg Cap, Midnight Egg Cap, Chocobo Egg Cap

Summer 2011 = 10
Lunar, Solar, Red, Green, Blue swmsuit x2 peices

Harvest Moon = 1
Moonlet Earring

Haloween 2011 = 4
Pumpkin Head, Unripened Pumpkin Head, White Pumpkin Head, Ripened Pumpkin Head

Christmas 2011 = 2
Reindeer Suit, Reindeer Antlers

New Year 11/12 = 4
Dragon Kabuto, Golden Dragon Kabuto, Crimson Dragon Kabuto, Black Dragon Kabuto

Valentines 2012 = 3
Paramour's Pendant, Platinum Paramour's Pendant, Band of Eternal Passion

White Day 2012 = 1
Peach Blossom Earring

Easter 2012 = 5
Pristine Egg Ring, Vibrant Egg Ring, Brilliant Egg Ring, Midnight Egg Ring, Chocobo Egg Ring

Event Items = 41


Achievement Items = 2
Gambler's Crown, Chronicler's Crown

Special Items = 2
Onion Helm, Asuran Armguards

So I should be able to free up about 1/3 of one of my retainers with this. Plus I will be able to complete the rest of the AF quests without clogging my inventory. Bring it on!