Can we get something clear?
We are NOT in lockdown.
Countries that are in lockdown have a very more stringent approach.
China was in lockdown and it was far far worse than what we have here.
You are allowed to go out (beyond the boundary of your house) for essential shopping, medical appts, or for work if you cannot work from home.
You are allowed to sit in your own garden or drive.
I think inviting neighbours to sit IN your drive might be pushing the boundaries.
There is some evidence anyway that the virus can spread further than 2 metres ( some experts have said more like 20 feet if someone sneezes or coughs.)
If you want to chat over the garden fence and keep your distance, I'd say fair enough.
But getting chairs out and congregating in a driveway would look a bit too much like a party and could be seen as the thin edge of the wedge ( more people might join in, you might not observe the distancing, etc.)