My Cirno Day was as follows:
① In the morning: It was really cold, and my only clean shirt was my "Wanna know how to keep an idiot busy? (See back of shirt)" shirt. I also started to explain Cirno Day to my mom who's never heard of Touhou before.
② At college, before class: Texted "Happy Cirno Day!!!" to all my friends. Only two replied, and neither knew what I was talking about.
③ In digital photography class: Apparently, someone's contact sheet had nine images on each page. I also copied the Flash file of Cirno's Perfect Math Class to the computer I was using.
④ After college: My grandma picked me up and coincidentally took us to the 99 CENT STORE. And I didn't make the connection until I was standing in front of the place.
⑤ After after college: We went to Costco, where I got a berry smoothie that gave me brain freeze.
⑥ At my grandma's house: Also saw that one of the e-mails she received had been sent to several addresses including "cinos87@somewebsite.com." Then we played Rummikub, and I purposely held my two 9 tiles in reserve until the end of the game, when I played them with two 9 tiles already on the table to form 9-9-9-9! But the very next turn my grandma used one of those 9s to win the game.
⑦ On the way home: Dug my DS outta my bag to do relevant things in the two games I had with me. In Super Mario 64 DS, I tried to do "no continues" runs of Cool, Cool Mountain, Snowman's Land, and Chief Chilly Challenge (completely forgetting about Dire, Dire Docks aka World 9). In the first two worlds I (unintentionally) had 9 lives when I died, but in the last one I only had 8 at the time. I also played the winter-themed minigames. After switching to Pok?mon KIRAKIRA DAIAMONDO, I polished only my Icicle Badge then went to Misty Lake Lake Acuity and caught the first new-to-my-Pok?dex 'mon I ran into: a female Ursaring. (With a Dive Ball, since it looked the iciest.). I nicknamed the thing Bearno and stuck it in PC Box 9.
⑧ Immediately after getting home: I found an empty Gatorade Frost Glacier Freeze bottle in my room.
⑨ Near the end of the day: I joined this forum just so I could post this list, but ran out of time and had to wait till today. I also finished explaining Cirno Day to my mom and showed her the subbed version of Cirno's Perfect Math Class. (Today, I showed her DeliciousMog's fandub.)
Edit: My profile says I joined at 12:25 AM today, but it was still Cirno Day in my time zone then.