There will no doubt be protestors in Manchester for the Conservative Conference. The protests are usually bigger when the party holding the conference is also the Government. When Labour were in Government, a long long time ago, its conference was the focus for protests.
Now the Conservatives are in power, people who object to cuts in Police numbers, to the renewal of Trident, to the huge increase in homelessness, to increased hospital queues, to brexit, will use their democratic right to protest, while the Government have their annual shindig.
But it is unfair to claim the protestors are there at the behest of Corbyn. They might well share the same values as the Labour leader, but they are not there to promote him, they are there to show their displeasure at the Government's austerity and its impact on real people. There will be Labour members in the protests, but the majority of the rallies will be organised by the likers of the Socialist Workers party and other fringe players.