From the 2018 HOG Chapter Handbook — CHAPTER WEBSITES AND SOCIAL MEDIA GUIDELINES, Page 81
Chapter activities are conducted primarily for the benefit of H.O.G.® chapter members.
There are two types of activities:

CLOSED EVENTS are those events which are open to chapter members and one guest per member.
OPEN EVENTS are those chapter events which are open to chapter members, national H.O.G.® XXXXXXXXXXX  members and other guests as desired.