Ordering from a restaurant. Where do i hire servers?

My FH and I would love to cater our backyard wedding with food from the award-winning restaurant I used to work at, which is where we met 5 years ago! They have a catering menu to order from, but they do not provide staff, as they are not a catering company. We're going for buffet-style, but we'd probably like somebody to set up food in chafers and portion out food to guests, maybe even deliver the food from restaurant to venue. Where can I find a service like this?

TIA for any suggestions!