Friend Consolidation
The act of taking a prearranged hang-out time with one or more friends, and
folding / inviting more, previously unmentioned and usually unnaproved friends to come along. Typically this is done because the "friend consolidator" has found somebody they find more interesting to go to the same event with but don't want to break plans and be an @ss,
or because they are
flakey and forgot the original plans in the first place.