You must plan the evenings events and then provide a printed program with the events and class roster. Invocation Someone skilled in public speaking, or a clergyman, should perform this task. However, you need to be careful not to offend anyone. Don't spend a lot of your money on music expecting everyone wants to dance. They came to visit.
Background music can be very conducive to visiting and it can be a lot cheaper.
Check costs of bar tenders and cost of drinks. Consider an all-day event with constant supply of food. This allows more visiting. Name badges are very important. Try to pre-print them so that they are legible.