Glad the info was useful, FDOS_UK.
The strike has been called for tomorrow. It will cause the maximum disruption for travellers and ITB visitors departing/arriving by air.
Trade ITB visitors will doubtless begin to return home at the end of the week. But ITB (unlike London’s WTM) is open to members of the public and I suspect they will be (or plan to be, if arriving by air) arriving in Berlin from tomorrow onwards. ITB does not close until Sunday March 12.