My main realization in this episode: K-ON will be dull without Yui, Ritsu, Mio and Mugi. The last half of the episode did some justice to the usual fun and crack of K-ON, so this is still good :)
And BTW, Jun has expressed her interest for joining K-ON next year if no members will join. Apparently, she is amused with the extravagant camp activities of the club. Hahahahahahaha.