https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities/TomTom

> TomTom is actively organizing mapping events. All edits made during those events are distinguished by the hashtag #tt_events.

> If you have remarks about a specific edit of ours, please drop a comment in the changeset, and we will do our best to respond thoughtfully. Or, you can also:  

> Reach out to osm@tomtom.com with any questions
> Join the conversation in the local community channels

They are active in the OSM Discord #oceania channel.