Dietary restrictions due to medical conditions can be a serious issue.
If the event is offering food of any kind, make sure that vegetarian, vegan and gluten-free options are available.
Another option would be to include a statement in all publicity materials requesting that individuals with specific dietary needs contact the organizer to discuss options that can be provided.
Other things to consider:
Tables with food should be between 28 and 34 inches from the floor to the top of the table.
If you must place food higher than 34 inches, you must ensure a portion of this food is available at the lower level.
Knee space: 27 inches from floor to bottom of table if guests will be using table for eating, writing, interviewing, receiving services, etc.
Aisles: at least 36 inches wide for maneuverability, and up to 44 inches wide if goods/services are available on both sides of an aisle to ensure access from both sides.
Check with catering vendor in advance to determine ingredients in food, so event may provide clear signage on ingredients in food or avoid ordering such foods for future events.
Consider providing foods that do not contain common allergens. Identify any foods containing common allergens, such as peanuts or peanut oils. Consider pre-plating these foods for safer offerings.
Clearly mark ingredients in food items and place food on separate platters.