The last few events I didn't have any luck finding shinies. Even the first Community Day garnered no shinies.
This one was completely different. I caught 82 Dratini's and 8 were shiny. I evolved 4 Dragonite's during the event, 2 shiny and 2 non. I counted them as I caught them and the shinies appeared 10th, 21st, 28th, 35th, 42nd, 62nd, 74th and 75th. The last 2 were back to back.
I just need 76 more dragon types caught to get the gold medal. Before the event I had 34/50 for the dragon medal. I also need about 10 more candies to evolve one of the Dratini's to Dragonair so I can have 1 of each.
I also saw tons of people playing for the first time since Jul 2016. Unfortunately nobody does raids.