Like hamas cares......
If they haven’t done it with the threat of military action, they are NOT going to release any hostages simply because of a march.
The marchers are trying to force Israel government to completely empty its prisons of Muslims in exchange for the bodies and a few living hostages.
The #1 terrorist raid organizer Haniyeh was one of over a thousand terrorists released in exchange for Gilad Shalit in 2011. That happened after Israeli surgeons removed what would have been a fatal brain tumor from Haniyeh.