The idea is that if it's busy at an uncontrolled airfield, you remain orbiting in the overhead at 2000ft until there's a suitable gap
Oh god know, please everyone don't hang around orbiting in the overhead at 2000', especially on a busy Sunday... Or if you do, then I'll join on base and be sipping tea by the time you all land, if you survive.
NEVER join on a crosswind, it is a recipie for disaster. Cross the upwind numbers by all means, but no further out.
Deadside - as mentioned above, do half an OHJ, descend to circuit height on way in, wizz over upwind numbers, downwind, base, final, land.
My prefered join is on a Base leg....