The most common way to experience food within the SCA context is through their "feasts", these usually being late meals held by candlelight in an effort to block out their modern surroundings and bring some magic to the experience. While one might not always gain a complete authentic experience with SCA cooking or dining, they are sure to take with them some snippets of the past.
One thing to be aware of, is that the SCA promotes learning through doing and this means ALL levels of authenticity is to be expected with feasts and feasting. Generally speaking, if you can produce well tasting food that is not blatantly modern, you will be accepted and no-doubt, asked to do it again! and again!
In some groups, such as where I played, they also serve out mid-day meals via sideboards where food is spread out where people can generally help themselves to what is there. Due to the nature of this type of service, this meal is usually included in the cost of attending the event itself. (feasts are usually a separate cost)
Typical dayboard service
This is a great way for an inexperienced cook to jump into the realm of food service within the SCA if they are weary of doing feasts but still want to create a meal from conception to service. It's also not a bad way to introduce a group to your food and to the preparation and service of meals/feasts if they are not yet accustomed.