I am still a younger DBA, 4 years, and frequented SQL Saturday events for the last 3.5 years averaging 10 a year as an attendee. I noticed as an attendee that there were not many sessions geared towards this. My goal was to submit to speak this year and have done so 4 times already and Houston next week. In Nashville, I saw an incredible session on speaking by Andy Yun. It was in that session I realized a session aimed at more of the beginning developers / query writers was needed so I came up with one. It was easy because I was seeing the same misunderstandings at my current job so ran with it. It is really aimed at issues a DBA knows, but not so much a younger developer such as implicit conversions, key lookups, data types and indexing temp tables. Every session I have done has been booked and I have received incredible feedback.
My topic isn't query tuning, but mistakes/misunderstandings that hurt query performance. A session on query tuning with a few examples is a great topic for new speakers to tackle since there is such a big demand! Yes, It always depends, but a few examples would be a great session at SQL Saturday.