Well, I shoot alone, almost always with RAW + OOC JPEG, and occasionally with 2 cameras. If the images are to be merged, it’s important that both cameras are set to the same time. Otherwise, I first had to correct the time information recorded in the metadata.
So … I copy all the images to my computer (in separate folders if I have 2 cameras with different times!), while the original images remain on the memory card as a temporary backup.
As shown here: UI, export and crop tool suggestions - #2 by Wolfgang, I rename all images on the computer.
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screenshot 2
The folder and images have the same leading name/title, followed by the sorting criterion, the 4-digit image number of the camera → YYYY-MM-DD_description_1111 -
screenshot 4 + 5
For images from 2 cameras, the sorting criterion is the time, followed by the respective 4-digit image number (in screenshot 4) → YYYY-MM-DD_description_hms_1111
Once the images have been renamed, I use FastPictureViewer to go through the folder (multiple times) and delete anything I don’t like. The viewer only shows the JPG of the raw and JPEG files, but deletes both. I don’t use ratings, etc. The viewer can display images at 100% and 300% at the touch of a button. That’s enough for me to make a spontaneous assessment.
At concerts, I often create (short) series. For better/timely comparison, I sometimes sort musicians into subfolders.
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Photographing together is certainly exciting – and challenging when it comes to sorting and deleting. After all, you don’t want to spoil each other’s fun. 
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I’ve written more here → Custom templates for filenames of exported files - #2 by Wolfgang or here → Bulk rename - keep connection between RAW and jpg - #8 by Wolfgang. … That is, you can also rename, etc., after editing, but this is unnecessarily complicated and should be limited to individual cases.