Welcome Bluecup, and thanks for uploading this. I really loved how you had two images only moments apart with a stationary camera. Kudos to you for excellent evidence there.
Here's what I'm seeing. For one this image WAS taken with a flash, you can see the reflection of the flash in the wood grain background of the image. And you can also tell that the flash was roughly at the same location as the camera itself. This leads to prime environment for what we call "Flash Orbs", or orbs created by the optical effects generated from flash photography.
So, having said that, I don't think its dust. In my opinion (and take it for what it is, just my opinion) I think the one on the left was caused by some tiny reflective object which came dislodged from the pitchfork. If you notice the two images which I've overlayed and matched the backgrounds on. The only areas which show motion are the ones where things moved. One thing that moved was you and the pitchfork. You first had it in an orientation closer to the person to your left (our right) and then brought it over closer to your body. The trajectory of that move every closely coincides with the location of the orb to your right (our left). And if you notice the motion blur on that particular orb indicates that when the flash fired and the shutter snapped, the object creating the orb was in rapid motion. I'm thinking it was a glitter particle, or dewdrop or some small reflective particulate which is creating a bright spot coming across as an orb in the flash.
The second orb over to the right, I believe to be caused by one of the links in the gentleman's chain. Between the two shots he moved ever so slightly which could easily have changed the reflective angle of one of the links in his chain/necklace. This can cause a flash reflective orb.
I must say though, interesting shot. Certainly looks like party I would love loved to attend.
See below for highlighted areas which I was discussing: