Details of the opening ceremony are always a closely-guarded secret, but what is known is that the budget for Rio's festivities is substantially lower than the £31m devoted to director Danny Boyle's London 2012 extravaganza.
Reports in 2015 suggested Rio ceremony director Fernando Meirelles - who made films like City of God and The Constant Gardener - could be working with as little as one-tenth of Boyle's budget.
