The 24-105mm lens is quite versatile as the photos from lock E6 show. Captions will indicate the focal length. There is a gallery of the Kayaking4Meso event at https://trulandphoto.zenfolio.com/k4m2018.
I chose the 45mm lens for the night time shots because of it's faster f/1.8 maximum aperture and yet it still has image stabilization, or vibration compensation as Tamron calls it. And 45mm is a good focal length for these types of shots.
I used ISO 800 and 1600 and f/2 and shutter speeds varied between 1/4 sec. and 1/20 sec. The vibration compensation allowed handheld operation at those shutter speeds.
Fifteen night time photos have been added to the gallery at https://trulandphoto.zenfolio.com/tugboatroundup2018. Here are a few samples.