Renewing of Vows

Friday night I had a party of 30. A couple renewed their vows and decided to have their "reception" at my restaurant. They made the reservation for 6:45 p.m. and didn't end up coming till 7. I had all the tables set up and luckily had all their waters made. They had a fixed menu so they were only able to order certain things THANK GOD. It got kind of frustrating because I would take orders based on tables so that everything would come out table by table but some people kept adding on things and they would order for people not on their table. When I made the salads no one remembered what they ordered so I would put it on the table that I remembered I got the order from and then they would tell me they never got their salad because they moved seats. All the kids were running around all over the place and it was just so chaotic. After all of that the bill came out to $150.00 and I got tipped $20. At first I was like wow okay I guess that's more than 10 percent but now that I think of it holy crap all that I had to deal with and $20??? Idk that's just my thoughts...