Maintenance and stabling facilities are being extended to handle a new fleet of DLR trains.
TFL expects to invite tenders next year and will outline the scope and programme of the £50m-£100m to interested bidders.
Interested firms can apply to attend the event on 30 October in London by registering with the TfL portal.
A market sounding questionnaire will be issued shortly after the event for feedback from attendees on topics such as interest, packaging and some technical topics.