In order to host a party, you have to enter the Parties section and click "Host a Party." You can throw a party every 2 weeks. You first party has to be birthday. After that, you can access all the remaining ones.
During a party, you can interact with different items. What's important is that most items give you XP or contacts. Depending on the item you interact with, you can also receive hobby or work points. You only need to set the items that can be interacted with.
As a host, you don't have additional energy points. You can only use the usual amount, and you need cakes to replenish them.
Leaving the party
At any point, you can exit your own party and join some other one. When that even ends, you will go back to the party. If others visit you often, they will provide you with party points.
Gathering party points gives you party levels. Each level yields a certain reward. These begin with small amounts of money and end on super tickets.
After the party begins, you will be able to obtain some special items. They cost nothing, but they provide activities for the party, making it easier to score the given amount of party points. They will make interacting with others easier, thus boosting the development of contacts.