I'd like to get a flu-shot on campus at the next pop-up clinic flu shot?

That's a good idea!: Getting a flu shot 2-6 weeks before first local cases of influenza begin appearing would be a good time. However, we can't have an entire country go to clinics all in a 4 week time span. Thus, for flu seasons that start in November, it's fine to get a shot between late-August and November. The shots may fully protect some people and partially protect others. Life is just that way, somewhat random.