Bare awareness while meditating in the Mahasi Sayadaw tradition While practicing the Mahasi Sayadaw style of meditation, noting the rise and fall of the abdomen as the body breathes, and noting other intruding experiences or phenomena, and essentially labeling that which is noted, at what point does one dispense with the conscious labeling in favor of simple non-conceptual bare awareness? Is the transition made by conscious effort or is it a non-volitional event that one simply recognizes and sits with? I think I may have some fundamental misunderstanding in this matter.
The noting shouldn't stop one from seeing things with bare awareness. One doesn't focus on the noting, one focuses on the meditation object.

...at what point does one dispense with the conscious labeling...

If one isn't  consciously aware of the noting then one will be unconsciously (un)aware of the noting. We note no matter what we do.

When we need to listen, speak, read, write or study then it is more difficult to note consciously. Some don't note consciously in these situations but they do continue mindfulness of bare experience.

I've never heard of an end to noting(conscious or otherwise) made by conscious effort or made by a non-volitional event.