Don't host a cook-out if you don't know how to grill
It was July 4th, and we were invited to a friend's house for celebrations, which included grilling some food. He was super excited as it was a new grill at his new house. He had a giant Weber charcoal grill and a whole bunch of burgers and brats.
I was looking forward to it because I grew up grilling with charcoal, and I prefer it over propane. The host, who is very nice and gracious, threw a bunch of coals on the grill, applied lighter fluid, and lit them. They then proceeded to put the grill back down and immediately throw burgers and brats onto it, directly over the flaming coals.
If you've ever cooked with charcoal, you can imagine what happened next. Burgers were somewhat salvageable, but the brats were black on the outside and raw on the inside - totally inedible.
I did my best to hold back, but eventually I had to step in and save the whole thing by explaining how charcoal works, direct vs indirect heat, etc. At this point, it was 5 pm, people were hungry, and the host was scrambling to find a store still open where they could get new food. They finally found a tiny grocery store still open and went out and brought back some very third-tier brand sausages (the ones that were burnt were a name brand).
The charcoals had also cooled at this point, so I threw a new batch in, and once they had ignited and gotten ashen, I pushed them to one side and cooked the new food using indirect heat, then finished with a sear directly over the coals. Food came out great, albeit it was nearly 7 pm at this point and people were ravenous.
So, if you haven't grilled before, please do a few trial runs and watch some tutorial vids before inviting people over for the premiere grilling event of the season.
EDIT - LOL a lot of people seem to think being able to feed 20+ people food is somehow asshole behavior. The cook did not know what they were doing. They ruined the food. They were upset about the whole thing. I offered to help, and they GLADLY ACCEPTED. I don't think I'm a hero or Gordon Ramsey. I simply knew how to use the tools that were there. If you're going to offer to cook food for people, you should be sure it's edible!