This meeting has been called to lobby against their mushrooming specifically in the higher education sector. If you are unfamiliar with zero hours contracts, here is a short introduction
from the BBC.
The zero hours contract is a far from new phenomenon, nor is it unique to the UK. As explained here, such contracts are not entirely unattractive; the example given is that of a student, but one can imagine all kinds of people who would not object to working on them or who would prefer them. It should be clear though that for most people they are anything but ideal, including all principal breadwinners - married men with families, and single mothers. It should also be clear that such terms and conditions are naturally far more favourable to employers than they are to regular employees.
According to the flyer for the London meeting - part of which is reproduced below - in some universities, as many as half of the staff are on zero hours contracts. The public services union UNISON is one of the organisations mobilising against them
If you have an interest in this subject but can't attend this London meeting, you might consider signing one of the Government epetitions against them
. Surprisingly few people have so far.