Southwark Webinar promotion
### Problem/Motivation
There is an upcoming webinar with Southwark Council which needs promoting.
### Proposed resolution
Complete the standard tasks for promotion in the Webinar process document.
### Target date or deadline
ASAP
### Remaining tasks
* [x] Promote the blog on Slack where applicable (e.g. #ai-initiative, #ai, #ai-marketing)
* [x] Speakers to promote the Webinar on their channels
* [x] Make The Drop Times Aware of the landing page / blog (via #thedroptimes or message Ben Peter)
* [x] Get included in DA monthly newsletter
* [x] Ask Amber Henry to promote on LinkedIn
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