Do you want to book someone as a client? Let them see what you can do without “pitching” – get on their program and SHOW THEM!
Are you trying to fill seats at your event? Guesting for them opens that door. Would your host like to come? Who does your host know that should be at your event?
Do you need an introduction to someone you want as a client? Who do they know that you can guest for, then in the spirit of reciprocity ask for an introduction?