A group of 4, then 6 floating, silent amber steady-glowing lights moving around one another before disappearing one at a time.

23:15: To the south, in the PDX northern flight path, I saw 4 solid, pronounced  amber or bright red(ish) orange lights in a square formation. One moved down and disappeared into cloud cover as the remaining three shifted and made an equilateral triangle. They fixed like this for 10- 15 seconds, then formed a isosceles triangle where two got very close to one another and the third was far from them, fixed into being equidistant from them for maybe 10 seconds. Then they all started shifting again, and one left the group and slowly faded away (no cloud cover), and the other two did the same in different directions, one at a time. Over by 23:18.
 My partner and I have seen satellites, meteor showers, and the space station before. This was VERY different in color and movement pattern from those or any aircraft I've ever seen. They could turn and reverse without an arc or pause. Amateur sky observers.
 My partner went outside after this. At about 23:45 he saw (lone observer), one by one, 6 of the same lights appear one-by-one in the same part of the sky, move around one another in the same way and then one by one leave in different directions and fade away (not into clouds). He said this took 4 minutes.