You can show your dedication and commitment to making and reaching goals, being flexible and having the ability to work with a variety of people through many volunteer opportunities. You don't need to limit yourself to only those directly relating to pharmacy. Think about or ask some pharmacists what people skills are important in their job. Likely they will say things like customer service, team player, etc. You can develop those skills and gain experience by helping out at events, serving meals to the homeless or volunteering in other areas that interest you.
With every good wish!