Negotiators from SADC and Zimbabwe's three main parties adopted a first draft on June 2nd.
The meeting in Harare failed to break this impasse, said Tomas Salomao, executive secretary of SADC.
Tsvangirai said he hopes the SADC summit will break the deadlock and ensure a fair deal.
Mr Mwanawasa was chairman of the South African Development Community (Sadc) when he was taken ill in June.
SADC's leaders, especially its younger ones, are increasingly loth to see their region dragged down by an ageing autocrat.
This will be further fostered, at regional level, through the partnership that has been established between SADC and UNESCO.
The troika did not indicate when or where the full summit meeting of the 15 SADC members would occur.
Botswana National Museum and SADC Heritage Association were the organising partners with the UNESCO Harare and Windhoek Cluster Offices.
Botswana has hinted that it may not, especially if the SADC's (previously feeble) election observers declare the poll unfair.
Under a SADC regional programme the country collaborates with Namibia and South Africa to protect and survey the fishing grounds.
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So far, the response from the Southern African Development Community (SADC), a regional club of 14 countries, has been muted.
Both the SADC and African Union have at least called for the presidential results to be announced as soon as possible.
But if the groundswell of opposition against him within Zimbabwe becomes impossible to ignore, they may have to modify SADC's stance.
SADC's leaders have ordered a ministerial team to investigate what is happening in the country, and the Commonwealth may follow suit.
Not so long ago, he could have counted on the support of SADC leaders, many of them fellow veterans of anti-colonial struggles.
"Elections held in such an environment will... bring embarrassment to the Sadc region and the entire continent of Africa, " he said then.
The 15-country Southern African Development Community (SADC), which has been trying to break the impasse, does not carry much weight with either side.
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Last week Mr Tsvangirai asked for the AU and SADC to help mediate a political solution based on the results of the first round.
The workshop also explored ways of strengthening the SADC Heritage Association which was revived with the support of UNESCO Harare and Windhoek Cluster Offices.
The involvement of SADC Secretariat in the workshop presented an opportunity to discuss the process of reinforcing the Culture domain within the SADC Secretariat.
After Mr Tsvangirai's withdrawal, Zambia's president, Levy Mwanawasa, who currently chairs the regional group, said it was scandalous for the SADC to stay silent.
According to the FT, Sadc finance ministers have been reviewing how to shore up Zimbabwe's collapsing economy - the official inflation rate is currently 6, 500%.
SADC's name, Angolan forces squashed the Congolese rebels' advance on Kinshasa.
Later, an observer team from the Southern African Development Community (Sadc) was held for some 45 minutes by Zanu-PF supporters at a farm about 20km (13 miles) outside Karoi.
The leader of the Southern African Development Community (SADC) team of observers, Tanzanian Foreign Minister Bernard Membe, has called for those running in the elections to show tolerance and moderation.
Thabo Mbeki, a former South African president mandated as mediator by SADC, reacted with a scathing letter, browbeating Mr Tsvangirai's lot for rejecting the ministry-sharing idea and accusing it of being a Western stooge.
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Mr Mwanawasa, the current chairman of the Southern African Development Community (Sadc), said he sympathised with Zimbabwean opposition leader Morgan Tsvangirai when he withdrew from the presidential election because of political violence against his supporters.
If it cannot, the disputes are to be referred first to the Southern African Development Community (SADC), a 15-member regional group which, after months of deadlock, succeeded in ramming the deal through on January 28th.
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