So confused .. don’t know what to call it or what to do

Okay so I plan on getting married next year August . My FH is graduating college this fall so me and my FH are having a very small intimate wedding in front of a waterfall outside of our state on a Sunday at that in the morning so we have to waterfall all to ourselves , only inviting about 8 intermediate family members . We plan on closing on the house we want summer of next year , not including student loans , and we want our honeymoon to be amazing which is the reason for the small wedding and cause we’re not that traditional. We’re not having a reception after , we were thinking about having brunch afterwards with our parents and siblings and bon voyage to our honeymoon we go . My family lives far away from us and his family lives here in the same state and his family is dramatic VERY and want us to have this huge wedding and wants to invite people they don’t even talk to anymore . So I was thinking okay to make it somewhat fair cause I’m not having a bridal shower , couples shower or anything if that sort cause that’s not right . Instead I was thinking of having a get together with EVERYONE that’s not invited to our small elopement type wedding before we say our I Do’s that weekend before Sunday . Eat , drink , dance just to make everyone feel involved in a way . ALSO , we don’t want ANY gifts from them and we aren’t expecting any either . Just before we become Mr. & Mrs. celebration party .
We don’t know what to call it or how to write that out on invitations for it