How to filter calendar by specific NID being viewed

I'm trying to do something that seems pretty simple but isn't working. On an events calendar, I want to be able to show a calendar display on a specific event node, where the only calendar entries returned are for that specific node. So when you're looking at an event, you see a calendar display showing that node's dates only. (this is specifically intended for complex events, repeat, multi-day, etc).

I'm creating a new calendar from templates, for node_field on node base table. The resulting calendar returns calendar entries for all nodes for the time period displayed. If I then add a contextual filter for Content: NID, and set it to use Content ID from URL, I'm not getting any results at all, viewing it either on the node's page, or filtering by NID from within views. This is true for all nodes tested, including those with single dates, and others with repeat, etc.

I feel like I'm missing something obvious. Any guidance is appreciated.