The house parties that I knew came in two flavors:Would a stalker casing the house have known that there would be no house party that night?
A. Planned parties- usually of the larger sort.
B. Spontaneous, or near spontaneous gathering of a relatively smaller sort- but could still be pretty large for those with alot of social contacts.
In regards to your question, it might depend on how close the murderer is to the victims. Category "A" type parties would be more publicized. As a result, somebody in a more distant orbit could no that there was no planned party that night.
But... it would take a closer orbit to know that as the victims had separate plans that night, there was probably not going to be any category "B" type gatherings that night.
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