Is this small and casual? If it is big and organised and costs to enter, I think people expect all sorts of stuff. If it is just small and casual and free, just make sure you have enough water and vaguely poll the riders ahead of time for an idea of what they want. Peoples' expectations rise in accordance with size and cost. I am often taken aback by the whining of demands on bigger rides LOL, veggie, gluten free, diabetics, allergies, paleo eater etc, you rarely please all the people. I kind of look at the food as a bonus now I have done a few centuries. I don't really go for a feed. I have been on a big ride that ran out of water in a hot Ut summer with no close options, that was really unacceptable. I am a planner and had a hydration pack but you know those boys are all out of water for the next 10 miles in the heat.