A write-up of the event, plus more pics, can be found here.
A write-up of Kiiyan’s birthday live will appear in the October 2018 issue of B=Pass magazine.
Item: B=Pass magazine
Release Date: 8/27/2018
Price: 860 yen
A new RG friend found this and gave it to me (thank you so much C-san!). The article apparently mentions Kiiyan overcoming his fear of flying. His tweet about it was more like “yeah, we’ll see….” It also describes him as being a popular seiyuu and mentions Shingeki no Kyojin.