No! All Accelerator Seminars can be stand alone programs open to non-members that focus on getting anyone closer to their goal faster. Members get early access to registration and a discount.
Accelerator Courses are a great way to improve your abilities in specific movements in a group setting faster then in a normal CrossFit class. All courses are 4-12 weeks long and meet 1-3 days a week. Expect home work and to work hard.