The charity's mobile cancer information and support service will be in Charles Square in the town centre from 9.30am-4.30pm on Friday, June 15.
John Galfin, from the charity, said: "As treatments improve, more and more people are living with cancer in their daily lives.
"They need more than medical help, they also need practical, emotional and financial support which the mobile team can provide.
"Cancer is the toughest fight many people will ever face. If you have any worries or questions about anything to do with cancer, whether it's about yourself, a relative or friend, come and talk to our Macmillan information specialists face-to-face. It's free and completely confidential."
No appointment is needed and all information is free. Call Macmillan free on 0808 808 0000 visit www.macmillan.org.uk