[header] How to throw a katy perry themed birthday party [title] Gather information. [step] This means, figure out the day of the party, the start time and the end time, where, extra information, and who you are going to be inviting. [title] Send invitations. 
[step] You are going to want to send out your invitations about a week or two before the day of the party. If it is a last minute party, get them out as quick as you can! You can make homemade invitations, or you can buy some from a party store.