At the health fairs you will be doing blood pressure, glucose screenings, cholesterol screenings, diabetic foot exams, and PAD screenings. No worries-they will teach you all of this the first semester in the skills labs.
Yes, your schedule will be different each and every week, but we do have students who work quite a few hours in a research lab so it can be done! Just make sure it doesn't take over your schoolwork! Pharmacy school is a whole 'nother world. Almost all of us did not study at all in undergrad (not even for orgo) and we study day and night now. The material is not difficult; it's just an insane amount for each exam. We have an exam pretty much every week, plus all of the other activities and labs, and if you work/do research, you may find that you don't have enough time to study adequately (happened to me this week actually. Now I'm cramming for our exam on Tuesday :/ ). But if you set your mind to it, I promise you can find the time for the things you love!