Conversation so far:
What happened with the deposition of Patrice Lumumba?
Kasa-Vubu announced that he had dismissed Patrice Lumumba and six of his ministers for the massacres in South Kasai and for involving the Soviets in the Congo.
Did Kasa-Vubu depose Patrice Lumumba?
Patrice Lumumba denounced his dismissal over the radio as illegitimate, and in turn labeled Kasa-Vubu a traitor and declared him deposed.
How did Kasa-Vubu and Patrice Lumumba solve the problem of declaring each other deposed?
Kasa-Vubu managed to secure the countersignatures of Albert Delvaux, Minister Resident in Belgium, and Justin Marie Bomboko, Minister of Foreign Affairs. He announced again his dismissal of Patrice Lumumba.
Where did Justin Marie Bomboko flee to?
Justin Marie Bomboko sought refuge in the presidential palace.
Did Patrice Lumumba regain power after being dismissed by Kasa-Vubu?
Patrice Lumumba resolved to join Deputy Prime Minister Antoine Gizenga in Stanleyville and lead a campaign to regain power. He never did though.

Question: When did all of this happen?
Self-contained rewrite: When did Kasa-Vubu's dismissal of Patrice Lumumba happen?