to get together with friends and eat dinner at one of their houses
「友達と家で集まってご飯を食べる」は
to get together with friends and eat dinner at one of their houses
のように言えます。
to get together で「集まる」
例:
I used to get together with friends from work and eat dinner at one of their houses after work.
「仕事の後、よく職場の友達と誰かの家で集まってご飯を食べた」
used to で「よく〜したものだ・以前は〜したものだった」
friends from work で「職場の友達」
after work で「仕事の後」
ご参考まで!