Episode 52: Anniversary episode, part 2.
Rice harvesting continues, Sunny has to leave early, new guests arrive: Jieun (Secret), Jiyoung (Kara), Krystal, Sulli, Luna (f(x)), Hara drives a combine.
Evening truth-telling gathering.
Narsha, Hyomin, Hara visit rice mill, first packages of G7 rice revealed;
G7 songs: Madonna (Secret), NU ABO (f(x)), Mister, Pretty Girl (Kara), Hoot (SNSD).

updated KBS link: episode 52 complete.
part 1, part 2, part 3, part 4, part 5. 

NU ABO, Mr. Boogie, LaChaTa (f(x))

Mr. Boogie (f(x))

NU ABO (f(x))

NU ABO (f(x))

NU ABO (f(x))

NU ABO (f(x))

This is a few weeks before Victoria joins, but it's the only high quality video from around the time when she joins. (OK, I lied. I found the high quality June 13 performance later, but will keep this here since that performance was towards the end of the promotions and it's their signature song at the time).