Every member has a home chapter that they designate in their Member Profile. If you would like to change your home chapter, you can simply change your selection in your profile. (click on your name at the top of any page, and choose "Edit Profile.")
Of course, members are encouraged to attend events from neighboring chapters as well! You may also like to join other chapter groups in addition to your home chapter, to be notified of their events, or take place in the discussions and comments as one of their group members. Join as many as you'd like! (You can "leave" at any time by choosing the "leave group" option at the bottom of the group activity page.)
Note: Chrome users: To join a chapter, select chapter and choose "Join Group" link.