If you're hosting an anniversary party at home or in a restaurant, consider having guests bring their food or drinks if it's not too much work for them. This can reduce your total costs significantly because they won't have to pay for their food and drinks at the party. If you do decide to host the event in a restaurant or other venue, be sure that they offer discounts for large groups or ask about special pricing on certain days or times of year (such as Valentine's Day).