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MIAMI(CBSMiami) — Security was tight and the mood festive in the Colombian city of Cartagena on Monday as leftist guerrillas and the government prepared to sign a historic peace agreement.

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United Nations Secretary-General Ban Ki-Moon flew in to join leaders from around the region and the world, and of international organizations, to witness the signing ceremony in the coastal city later the same day.

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The more than 2,500 guests have been invited to wear white as a sign of peace, and Colombian President Juan Manuel Santos will put his signature on the 297-page accord with a pen made from a recycled shell used in combat.

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A nationwide referendum on the accord will take place on October 2nd.