Here's a quick checklist you can use to help put on the best sales meeting possible. You may have a few more specific to your industry, but this is a good start and will get you thinking. Also, immediately following a sales meeting, have a debriefing with your key people to see what you could've done better to improve your next meeting.
Venue booked or room reserved
Theme/Content selected and created
All department heads notified
Vendor partners invited and confirmed
Other guest(s) invited and confirmed
Food and beverage ordered
Product samples ordered and arranged for delivery
Hotel rooms booked and confirmed for out-of-town salespeople
Schedules arranged to cover sales floor (if meeting is during working hours)
Agenda created and provided to everyone
Copies of all documents, new item information and data sheets printed
Post-meeting cleanup arranged