The phrase 'talk on the topic' is correct and usable in written English.
You can use it when an example of a speaking activity needs to be specified, as in: At the meeting, each member was asked to present a 5-minute "talk on the topic" from the discussion document.
In Extract 1, a news announcement (lines 1 2) is followed (after some understanding difficulties) by a topicalizer (line 20) and talk on the topic proposed by the announcement (line 24).
Diamandis has advocated asteroid mining for some years, and gave a TED talk on the topic in 2005.
Months after he committed himself to promoting nuclear energy, he gave a talk on the topic in 1997 at Harvard University called "A New Nuclear Paradigm".
The drive to change corporate taxation may have friends in high places, but the prevailing view is that there will be more talk on the topic than action.
Her mother pressed her tongue down with a fork and said it was a shame, Pastor Akinwande was going to talk on the topic of Abraham and Isaac.
So the abuse directed at Sarkeesian struck a nerve, and in 2012, she was invited to give a TED talk on the topic.
European Union Climate Commissioner Connie Hedegaard said talks on the topic aren't yet "mature".
He also gave regular public talks on the topic of spaceflight.
Despite ongoing talks on the topic of league reconstruction, the Scottish Premier League has announced a start date for the next campaign.
But the most important and most fundamental thing that I'll be discussing in my talks on the topic will be the need to build resilience into the core of our organisations and to be prepared for the unexpected. .
Wheeler had also become President of the Museums Association, and in a presidential address given in Belfast talked on the topic of preserving museum collections in war time, believing that Britain's involvement in a second European conflict was imminent.
