I always offer to send them out for my host. In the last 18 months, only 2 have chosen to do it themselves and it has not worked out well. I try and send the address form to them around a month in advance if possible - or as soon as I can if it is booked in closer. I ask for the form back 2 weeks before their show date and try and get the invites in the mail no less than 10 days before the show. My hosts that take advantage of my offer really appreciate it and then only have to follow up with reminder calls.