Basic white dishware, glassware, silverware, white tablecloths, chairs and tables are all included free at every venue. However, if you are having a buffet, they generally do not place the plates at each place—they stack them at the end of the buffet. Instead, the napkin fills the place a plate would, in whatever style of fold you request. Here's how I did it at my last event:
Otherwise, you would need to rent chargers or see if they'll agree to place the plates at each place instead (but then folks have to know to grab a plate from their seat rather than head straight to the buffet the way they normally would). Chargers don't have to be expensive, though. I used faux Monstera leaves as chargers at this event: