Every technical meetup group I have been involved with his perennially desperate for speakers. If you make the effort to be present both physically and virtually for about three meet up groups over the course of about three months, I think it’s very likely you could get slotted in to speak by month 6. It’s possible they would add you on as a moderator for the group, guaranteeing persistent visibility if you are willing to put in the work (assuming you are a honest and decent person, this is a win-win because these communities have a huge positive externalities)