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The total solar eclipse is the predictable one. If you’re inside the path of totality, the Moon’s shadow is coming whether the aurora cooperates or not.
The northern lights are the bonus.
They depend on geomagnetic conditions, darkness, clouds, and location, and there is no guarantee that an observer will see them during totality. High latitude observers may have another opportunity later that evening if space weather and local conditions remain favorable.
That uncertainty may actually make August 12 more interesting.
Prepare your viewing location. Check the weather. Have appropriate solar protection ready. Follow real time aurora forecasts later in the day. And when the moment finally arrives, remember to spend at least part of it simply looking up.
Some astronomical events are worth photographing.
Others are worth remembering.