The Azimio coalition will on Friday update the country on its preparations for Monday's grand march to the State House.
The event is billed as one of the most consequential political actions in recent years with opposition leader Raila Odinga expected to lead the demonstrations.
Nairobi Senator and ODM secretary general Edwin Sifuna said the opposition will apprise its supporters and Kenyans on how Monday's protests will be conducted.
"We will be giving a media briefing tomorrow (Friday)as the leadership of Nairobi on the preparations for the 20th," Sifuna said.
Sifuna, who spoke on Thursday morning on Citizen TV's Daybreak show, allayed fears that the protests will be chaotic as claimed by Azimio critics.
"We want to assure people that they can rest easy," he said.
The senator also revealed that he will be writing to Nairobi Governor Johnson Sakaja and the police over Monday's protests for facilitation.
"We will write to the head of traffic in Nairobi to inform him which roads are going to be affected," said Sifuna.
"We will write to the governor, I have told him that we will receive visitors with dignity and he should not embarrass us. We want clean public toilets so that people can use them, running water in Nairobi and ambulances because somebody can faint of exhaustion."
President William Ruto on Wednesday told Azimio to work with the police to ensure that businesses are not disrupted when they will be demonstrating in the Capital.
Ruto warned that the government will not allow the destruction of property, loss of lives, or wanton destruction of property during the protests.
Sifuna said the law protects demonstrators who exercise their right to picket, protest, demonstrate or submit petitions as long as they do so peacefully.
"We went to court to get guidelines on how to exercise the rights under article 27. We have the blueprint on how to successfully undertake maandamano and that is what we are going to implement," he said.
He said the law provides for what the demonstrators can ask of authorities to guarantee peaceful demonstrations.
"When we ask for these things they are our rights, they are not favours. We know our responsibility and we are prepared."