Double Repotting

At the container gardening club display, in Hillside Mall, I asked about container gardening in general. The lady's most interesting claim is that some plants are transplanted into the garden in spring, and out of the garden in fall. This is fine if the plants are healthy.
Of course there is no reason to transplant a bonsai twice in one year. Or is there? When I read about the expo in 1912, where bonsai were introduced to the west, the picture showed a Japanese fella planting out his bonsai trees in a small plot. But because the display was only there over the summer, I assume the FIRST TREES in the WEST were double transplanted.

Oh yea - in the northern cities, people plant out fig trees in spring then dig them up in fall.