Suzumiya Haruhi no Yuuutsu, K-On! Recommendations
Both of these series were animated by Kyoto Animation, featuring similar quality and style in animation. Both accentuate cute "moe" qualities, light but relaxing slice of life-like episodes, and innocent high school comedy.
Both of these take place mainly in clubs and are made by KyoAni.
Most of the events in both stories occur within a high school club. Both are full of humor and plenty of "moe"
Both rely on clubs, though admittedly go in completely diffrent directions. the art is also similar.
The slice of life is very similar in both series and they both have the same kind of "club" ideas, which is too promote theres and achieve .
In both series main character is looking for a club to join.
Both are about a group of friends who spend time in a club at school. While both series are interesting slice of life, it is to note that Haruhi Suzumiya as a supernatural side to it as well while K-On! concentrates heavily on music.
There's a certain episode that they play in a cultural festival it kinda remind of that :))
While K-on has no sci-fi elements, both of these series are about high school kids who create a club.