Provide something. Anytime you are inviting guests during a meal time it is polite to provide food for the guests, with the exception of babies not on any solids, and individuals with special dietary needs. I avoid feeding hot dogs to 1 year old children. It is on the top of the list of foods that cause fatal choking. Save those for the older guests.
You don't have to spend a lot of money. For example, for the one year old children; offer applesauce, small chunks of peaches, graham crackers, bananas, pudding, foods that are low choking and allergy risk.
Avoid the following foods which are high on the choking and/or allergy list; peanut butter or any form of nuts, red dyes (which are sometimes made from bugs!), cheese, eggs, fish, aspartame (many children react to this artificial sweetener), strawberries, peanut butter or nuts. (You probably know all that stuff already anyway.)
If you offer safe foods, parents who did not bring food will appreciate it and will not be as likely to feed foods that may cause choking or allergies.
Have fun!
B.