After cutting the fabric, it's time to sew the mats together. Place the two pieces of fabric right sides together, aligning the edges. Pin them in place to prevent shifting while sewing. Using a sewing machine, sew around the edges, leaving a small opening on one side to turn the mat inside out. If you are sewing by hand, use a simple running stitch to secure the edges. Once you have sewn around the perimeter, carefully turn the mat right side out through the opening. This step is crucial as it gives your Christmas dinner mats a neat finish.