Is there a way to "force" format a Heading that doesn't screw up the Table of Contents?

Don't use hard returns. Anchor an empty Anchored Frame frame at that heading, Run Into Para, from Right, height equivalent to 3 heading text lines.

Put a non-breaking space between Tuesday and morning, to keep them on the same line (Ctrl+spacebar).

Grab the left edge of the AF with the graphics tool and drag it left it to squeeze the heading left until it flows as you desire for on-page appearance. The TOC entry will still be one line.

I can think of several other ways to accomplish this, but the RRI frame technique is by far the easiest, and the most comprehensible to future document stewards.