How we change what others think, feel, believe and do
If you are just a presenter it is worth knowing what the catering arrangements are as you may be asked about this by delegates, who assume that you know everything about what is going on.
If you are an organizer then you need to ensure all catering will arrive at the right place as planned and should check this with the venue staff. Setting up for what catering is required is of course done well before the event. If you need more coffee, etc. you can usually arrange it as needed at the time, but do be aware that this might incur extra cost.
For presentations in the workplace, you might arrange for catering to be delivered or alternatively just point people to coffee machines and the local cafeteria. If needed, you may want to provide vouchers so they do not have to pay.
Prepare for appropriate refreshments beforehand and do stick to the times for these in your presentation. You will not endear yourself to a thirsty audience who can see coffee going stale on the table at the side.
The question of whether you have refreshments in the room or outside depends on whether you want to keep them in the focusing isolation of the room or give them a break in a change of environment. Food, and especially drinks in the room, leaves smells that can become unpleasant.
Ensure sufficient coffee breaks -- at least every two hours is common. Either have coffee brought into the room or point people to refreshment machines outside.
'Coffee' here includes tea, juice and water. Tea is best served fresh, and a flask of very hot water and tea bags can be provided. This arrangement allows many variants and you can offer general tea variants, such as Assam, Darjeeling and Earl Grey. You can also offer herbal teas and infusions for those who are avoiding caffeine.
Juice often comes out of a carton, but if you want to wow the crowds, offer freshly-squeezed orange juice -- this tastes much nicer and actually contains vitamin C (which is killed by the heat-treatment of boxed OJ).
You may want to provide water on the tables for delegates. Both sparkling and still water is often expected these days. Depending on the event and numbers of people, you can also allow them to get up at any time to help themselves to coffee from a side table.
Provide meals at the appropriate times. Cater for different dietary needs, depending on your audience's needs. At the minimum ensure there are vegetarian options. Also beware of any nut allergy issues and label anything nutty. Beyond this you can cater for vegan, glucose-free, kosher, halal, etc. A simple way to figure out what is needed is to ensure delegates are asked beforehand. Do not worry excessively about this as people with special diets are often used to managing this themselves. Venues also are accustomed to handling such requests.
For presentations where there is a short lunch, buffet meals are informal and let people choose how much they want to eat and lets them mix informally with other delegates.
Sit-down meals take more organizing and are somewhat more formal. They also require more service staff and take much longer. They can be served in the same room but often require going to another room, or even outside to a restaurant.