A lady never shows up with or as an uninvited guest to a party.
If a Lady is throwing a party for her birthday it is mandatory for her to pay for her guests. A lady should never expect her guests to pay when it is her birthday, but a lady who is a guest should never expect to be paid for.
A lady makes sure her invitation, whether it comes from telephone, email, or by mail provides all the necessary information. She gives the time, the date, the location, and the expected attire.