Don't be worried about them "forgetting about you." At any given schools your interviewer might not even be on the admissions committee (some are and some aren't). So they fill out a form about you (ranking you from 1-5 on some things, and writing out longer answers on others). So even if you interview the day before they're sitting down to make decisions, the possibility exists that all they have is a sheet on you and not the interviewer who actually interviewed you. (not that this is always the case, but it is highly likely). Thinking back, none of my interviewers were actually on the admissions committee.