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What should the joiner table include when joining two tables?

I am working on a database which as a user table and a party table. A user can go to many parties and the party can host many users. So this is a many-to-many relationship. But since its not possible to have a many to many relationship between two tables, I created a joiner table called 'user_party' table. Now I am not sure what goes in the party table and what goes in the user_party table. For example, user table has basic columns like user_id, user_name, user_email, etc. and party table has information like party_description, party_time, party_location, etc. Should these party table values go to user_party table instead? What values should the joiner table include and what goes in the party table?