Answer: Sub-goaling
Explanation:
Sub- goaling is defined as the process used in field of psychology where the a particular cluster of steps is provided with label in a function for achieving the complete goal. These step cluster are performed in step by step process for processing towards goal through sub-goal.
According to the mentioned scenario, dinner party is being planned through sub-goal manner as the steps for performing each task is divided according to day and time e.g- Laundry will be done on Thursday etc which will help in achieving party hosting goal easily by steps.