Christmas!
Ui remembers how Yui once attempted to give her a white Christmas by sticking pillow stuffing on the tree outside. Ritsu decides to hold a Christmas party for the club, and while her initial plans of holding it at Tsumugi's house fail, they eventually decide to have it at Yui's house, also inviting her friend, Nodoka Manabe. They also decide to do a gift exchange, and go shopping for various gifts. Ui prepares a lovely Christmas dinner for the group, which gets a little out of hand when Sawako shows up out of no where. During the gift exchange, Yui and Ui give each other some warm things for the winter. After the rest of the group leaves, snow falls and Yui and Ui decide to sleep together, although Yui ends up hogging the sheets. In the New Year, the club decides to go to the shrine to make their New Year wishes.
Aired 15/05/2009EP 7 - Christmas!

K-ON!
Hirasawa Yui, a young, carefree girl entering high school, has her imagination instantly captured when she sees a poster advertising the ‘Light Music Club’. Being the carefree girl that she is, she quickly signs up. However, Yui has a problem, she is unable to play an instrument.
When Yui goes to the clubroom to explain, she's greeted by the other members: Ritsu, Mio and Tsumugi. Although disheartened at Yui’s lack of musical know-how, they still try to convince her to stay to prevent the club’s disbandment. After playing Yui a short piece which re-ignites her imagination, they succeed in keeping their new member and guitarist.
Along with the tasks of school and homework, Yui begins to learn the guitar with the help of the other band members, experiencing many mishaps along the way. However, with the school-festival drawing near and Yui getting stuck with her practice, will the Light Music Club be ready in time for their debut?
(Source: MAL Rewrite)