Taking valuable vacation time and dollars for obligatory family or friend visits. Usually oblications blow your PTO balance at work, meaning you will not have a real vacation in the foreseable future.
We didn't make it to the Carribean this year because we sent spring break on an oblication to see the in-laws.
The state or practice or a practioner of total lack of awareness or indifference to the universe at large or the effects of one's actions on those around him.
Obliviationists do not use rear view mirrors, turn signals and do not mind if other shoppers cannot get around them when the block the lanes in grocery stores and other public places.
A required or expected visit to family/in-laws during your vacation time. Not exactly what would qualify as a holiday.
But would be a combined obligation/vacation.