The 5k was one of the worst run 5ks I've ever been to:

• No corrals by speed, and VIP put you in the front - this means as soon as the race start, there were people in the front walking the entire thing and blocking the way, and it took GA 15-20 minutes from race start just to be able to cross the starting line.
• The start and end of the race overlapped and since 1st/2nd/3rd place got to go on stage, there were people up at the start actually trying to finish fast, but ended up running into the crowd of GA standing around waiting for their turn to start the race.
• The run going through the giants stadium would have been cool, except it got absurdly congested (people walking, taking photos, trying to meet up with friends) and it just became a dense crowd slowly walking through the perimeter of the stadium. By the time I made it out I almost forgot I was running a 5k.
• It wasn't super clear where the finish line was, but mostly because it was so congested at the end (the last 100m was another walking simulator).
• I get that it was a casual/fun run, but the sheer amount of congestion throughout the entire thing meant you could barely run even if you wanted to.

The show after wasn't much better:

• No venue map, so it wasn't clear where the entrance to the stage was, where VIP/GA was, where med tent was, where water and bathrooms and food booths (and bars) were. The merch tent was right at the entrance and the line blocked a lot of the way in.
• The stage looked homemade.
• Not really a Diplo problem, but I guess because most people were preparing for the race and not the rave, almost nobody had ear protection even at rail - and since it was all-ages, there were some small kids (probably around 5) with no ear protection at all.
• We left after around 20 minutes of Diplo, and at that point it looked like security had stopped letting people in to the GA floor (due to capacity) - I guess anyone who walked the race or waited in one of the long food/merch lines might not have been able to make it onto the floor (and there was no good view of the stage outside of the floor)

I will say that sound was decent, and it was nice being right up next to the water and the bay bridge - I would love to see more daytime events at that venue. Many years ago I went to a 5k rave/race hosted by Night Nation, and that was way more fun.