Active swarm in my yard - seeking advice

[Lisa Bruner]

Hello. I've never seen a bee in my yard but I was pressure washing my deck and looked up to see thousands of bees swarming around. I'm not sure if they had a nest under my deck, or if it is just a coincidence, but they don't seem to know what to do.
Is there a way to get them to relocate? They are currently flying all over my yard and half of them are congregating on a tree.