Are you doing something interesting, super exciting and fun that you would like your peers to hear about? BSides is organized by the community for the community and everyone is encouraged to participate. If you would like to share the excitement about the work you do, enable others to learn from you and gain recognition in the community, give a talk or a workshop at the event.
More about open CFP at https://bsidesljubljana.si/cfp/
Fame and glory for awesome work you do for infosec community :)