Reps of Colombia's government and guerrilla group meet for peace talks

The government has accepted the ELN's proposal for a temporary and experimental ceasefire, emphasizing the need for it to be verifiable and include territorial arrangements. The government offers guarantees for the ELN to hold a congress, potentially their first public one, to make decisions about reintegration into civil society. All these matters are to be agreed upon at the negotiation table.

What is the significance of the proposed congress for the ELN?

What must be agreed upon at the negotiation table according to the text?