You can use these badges for e.g. blog posts to promote the fact that you are going to GUADEC or are even speaking at the conference!
GUADEC 2019 badge (SVG source)
Going to GUADEC 2019 badge (SVG source)
Presenting at GUADEC 2019 badge (SVG source)
We have slide templates for GUADEC available in the presentation-templates repository. The template can be used with Markdown or LaTeX (via Pandoc). Any help with further formats is appreciated and can be added to the repository.