Interesting topic, Preach!
I met Pierce The Veil twice at Warped Tour in 2015
I met Riff Raff (He's my boo thang) at Warped Tour 2015I kinda met Patty Walters from As It Is on accident- I was promoting for Pierce The Veil at Warped 2015 and he accidentally was in a picture behind me. xDAnd I also met Fall Out Boy on the Boyz of Zummer Tour in 2015 when they toured with Wiz Khalifa and Hoodie Allen.If you're lookin' to meet some famous bands or any bands you like at all- I recommend seeing who's going to be on Warped Tour and going to that if you're interested. That's definitely the easiest place to meet your favorite artists.
Lucky you! I wish I could of met PTV, Patty and Riff Raff.
Last summer I went to Warped Tour where I met some members of the YouTube collab channel My Digital Escape. I got to meet Johnnie Guilbert, Jordan Sweeto, Jeydon Wale (twice), Bryan Stars, along with another youtuber Deefizzy.
I'm not sure how many people here on FH know them though.