If I would be living out my specific "fame", I would go to #39C3 with a t-shirt saying "I have 10K+ followers in the Fediverse". At #FOSDEM I would wear a T-Shirt saying "I use garage as my S3 object store and I like it a lot" :)

(disclaimer: at Red Hat I am part of the marketing team, so target audience analysis comes quite naturally to me ;)