If you are entertaining out side, you will want some wind proof lanterns or candle containers. Small jars with tea lights work great. You can also use flower vases. Check out the candle page for some more ideas. Use a table cloth if you don't like the look of the table.
TV trays are another idea.
TV trays also can be an extension to your buffet table. To spruce up an old TV tray, try creating a mosaic on the top or just give it a fresh coat of paint. It's also a good idea to have some bibs on hand if you have tiny children. Some places to shop.