Party members said to be backing a faction led by Justice Minister Emmerson Mnangagwa were on the campaign trail Monday urging party supporters to vote out Vice President Joice Mujuru
Various African countries, including Swaziland, Tanzania, Zambia and several others, were represented by high-powered delegations at the event.
Sibanda was arrested Friday afternoon by detectives in Harare who picked him up from his Nyamandlovu farm, Matabelaland North province.
Most people say the current studies at primary and secondary schools are so academic that they do not fully equip students for real life situations.
Zimbabwe Independent editor Iden Wetherell says the Zanu-PF debacle is hard to ignore.
Senior Assistant Commissioner Charamba confirmed the arrest to the state-controlled Herald newspaper though not giving more details.
If adopted, this will complete the purging of Vice President Joice Mujuru and her allies from key party organs such as the Central Committee and the Politburo.
Sikhala says after being released, he later received a telephone call informing him to surrender himself to the police in Harare.
The Zanu PF congress is penciled to begin on Tuesday and ends on Sunday with some delegates expected to be housed at some schools in the capital.
The Media Monitoring Project of Zimbabwe recently noted biased coverage in the state media, which has been aligned with the alleged faction of Justice Minister Emmerson Mnangagwa.
Muchinguri said the fact that most rape cases were occurring at home is an indication that something has gone badly wrong with the family value system in Zimbabwe.
Police were still interrogating Sikala at the time of going on air and his lawyer, Douglas Mwonzora, told Studio 7 that he suspects that he is being charged with treason.