David Lunts, executive director of housing and land for the GLA, and Brendon Walsh, director of regeneration, economic development and environment at Hounslow Council will provide the opening speeches at next month's Sitematch London event.
The Sitematch London project has helped stimulate development and regeneration in the London Borough of Sutton, according to a key council figure.
Three sites owned by Royal National Orthopaedic NHS Trust have been added to Sitematch London.
Representatives of two statutory consultees for planning applications will be attending the Sitematch London event to meet with developers.
The Greater London Authority will be represented at the Sitematch London event on 6 November to discuss sites with developers, and has added six of its development sites to the Sitematch website.
PTAL scores which give information about access to public transport have been added for each site on Sitematch London.
Another NHS trust has teamed up with Sitematch London to meet with developers at the event on 6 November.
Subscribers to Sitematch London can now view details of CIL charging schedules of participating councils.
The opportunity to win a bottle of single malt Scotch whisky or a bottle of champagne is still available to those taking part in the Sitematch London online survey.
More than 20 sites in the London Borough of Haringey have been added to the Sitematch London database, so that developers and the council can discuss them at meetings during the next Sitematch London event on 6 November.