A sighting of 2 types of craft over a two week period.

I awoke on the first night around 2:00am, I looked out my window on the warm evening and observed two objects in the sky that seemed to hover and did not move like planes.  They circled each other a few times.  After a while I became very tired and had to go to bed. 
The next night I set my alarm on purpose to see if they came back, and was not disappointed, I observed 3 objects this time, 2 boomerang and one oval I was prepared this time with binoculars and a stand made out of LEGO to support it.  I watched the objects through an open windoe (without a screen)   
Over the rest of the 2 weeks I observed the objects about 10 out of the 14 days.  I observed a pattern that seemed to support the idea that they were looking for something.  
The area they were located in was beside a cliff that led to the Bow River, just down from a church.  
Some of the things I was able to observe between the objects was a sort of "static electricity" bolts as the objects came close together.  The oval objects had a brighter band around the middle.  
Most curious was that the objects seemed to remain the same sort of yellowish colour, sort of like reflection off the city lights.