Ginny's enthusiasm over having a girls' night in showed in the manner in which she arrived. Early. Ginny usually could handle being on time, but she was more likely to late than early.
Having Luna and Hermione together in the same place at the same time had many possibilities in Ginny's mind. First, Hermione was always there be logical, keep Ginny's thoughts grounded... and Luna was there to make Ginny think, and in many ways being uplifting. They both tended to give different angles. Ginny found it helpful, interesting, and fun. Plus, she really looked forward to seeing her old friends--- or anyone that she didn't see everyday flying on a broomstick.
Ginny knocked on the door, two tubs of icecream (mint chocolate chip and cookies and cream) icecream in tow.