It is true that they now only do cafeteria style service as was sometimes done with Wayside. Therefore they do need a few less volunteers. The ideal total team runs about 15-20 people. The roles for volunteers are somewhat different than previously, but they are all about serving the clients. My suggestion is to get the list of positions from Tom Nelson and make it clear how you would like to serve from this list. From 4:30pm to 6pm they need help with a variety of food preparation jobs. Then there is work to serve plates, monitor cleanliness of tables and condiments, washing dishes and if there is enough help, serving drinks. Finally there is a lot of cleanup work to do when the meal is over at 7pm. It is still permissible for the team to pray prior to food service, but it may be one of our volunteers that has to initiate it.
I would expect that anyone coming to serve at Preble Street now will find it as satisfying an experience as ever. I also recommend against expecting everything to be the same as before. However, if you are open to serving however is most helpful for the cause, you will be blessed in your experience of serving in love.