I generally do not encourage students to offer “Free” Reiki because it does seem to cheapen the public view of Reiki.

That said, offering Community Service is a wonderful thing. Many hospitals today have a group of Reiki Volunteers to offer Reiki to the sick. They are rewarded with experience, a sense of community, and various other benefits depending on the hospital.

Some churches, such as Spiritualist or Unitarian (really depends on the specific church, but sometimes) offer Reiki Groups and opportunities for Reiki and other healers to offer sessions to their members.

There are various charities and charity events that would love volunteers. Talk to them, some may say yes, others may not know what you are talking about.

There are various Reiki Practitioners/Masters offering Reiki Shares/Healing Groups, Meditation Groups, Drumming Circles, and other events to share your gifts.

Talk with your Reiki Master/Teacher. They may have some ideas.

Finally, I started by sharing with family and also friends at college.

Good luck and Safe Journeys
References :
http://www.apath2healing.com
Reiki Practitioner since 1997, Reiki Master/Teacher since 1999