The MS Challenge Walk kicked off this morning at the Hyannis Village Green.
Walkers will travel 20 miles to Brewster today, before heading to Orleans and Eastham tomorrow.
The event wraps up on Sunday with a walk back to Dennis.
Participants will then be bused to Hyannis where they will complete their journey at the Village Green.
Organizers are hoping to raise $1 million dollars for MS research.