Demonstrators will act as dead and blood-stained bodies, at the Baby Show in Manchester this morning.
The action is a protest against the recent purchase of arms fairs by the Baby Show's owners, Clarion Events.
The protest will be entirely peaceful.
Clarion's involvement in the arms trade has triggered a backlash from their own exhibitors, with Bounty withdrawing as a sponsor and Unicef refusing to accept donations from ticket sales.
The demonstration is being organised by Campaign Against Arms Trade (CAAT) which works for the reduction and ultimate abolition of the international arms trade.
Many of the demonstrators will be members of Medsin, a network of students with an interest in global health and tackling health inequalities. Through their projects and campaigns they aim to promote health and take action in their local and global communities.
Clarion also faced a backlash at their Baby Show in London in October.