"At the eisteddfod, all the performances should be through the medium of Welsh, " he said.
BBC: NEWS | UK | Wales | South East Wales | Language knocks out Punch and Judy
"It's certainly not a city where the eisteddfod would want to leave its Welsh-speaking stamp, " he said.
More than 6, 000 competitors took part in the eisteddfod - which is the oldest and largest festival of its kind in Europe.
Dr Lewis said he saw no reason for the eisteddfod to cross the border and said he would not attend if it did.
"And now many of them are going to come to the eisteddfod to attend some workshops I am holding into Indian dance, " she said.
BBC: NEWS | UK | Wales | South East Wales | Indian feel to eisteddfod
Speaking earlier, festival organiser Hywel Wyn Edwards described the Eisteddfod as "a phenomenal success", and said he hoped the show would leave its mark on the area.
BBC: NEWS | UK | Wales | North East Wales | Traders count cost of Eisteddfod
Part of Kilford Farm, a dairy farm in the area, has been transformed in to the Eisteddfod site for a week, with a 4, 000-capacity pavilion at its centre.
The eisteddfod's shadow governing body met in Aberystwyth on Saturday and said this year's festival in Newport, south Wales, was already showing signs of losing a large amount of money.
BBC: NEWS | UK | Wales | North West Wales | Eisteddfod's future 'in jeopardy'
"The Eisteddfod organisers, the trade and tourist organisations, Denbighshire County Council and the high street banks have all worked swiftly to bring the euro zone into fruition, " Mr Jones added.
British Embassy officials in Armenia became suspicious when several young single men - who had joined a folkdance group the previous November - applied for visas to compete at the eisteddfod.
And although in recent years, a growing number of women poets have broken into the traditional male preserve of writing in cynghanedd, none of them have succeeded in taking the eisteddfod's main prize.
Other areas of discussion include separating the organisation of the eisteddfod week from the organisation of the competitive events during the festival, maintaining volunteer commitment, and maximising media impact in the digital age.
They will also consider other sources of income for the eisteddfod, sharing resources with the Urdd youth organisation, increasing visitor numbers, including among non-Welsh speaking families, and better assistance to new and English speaking visitors.
They will also consider other sources of income for the eisteddfod, sharing resources with the Urdd youth organisation, increasing visitor numbers - including non-Welsh speaking families - and better assistance to new and English-speaking visitors.
In two of those years, the eisteddfod would be held at permanent bases, possibly in north west Wales and west Wales, while in the other two years it would alternate between temporary homes in north and south Wales as it currently does.
And Robin Tomos, from the National Eisteddfod where the painter was both exhibitor and adjudicator, said Sir Kyffin had "strongly believed in its significance as a stage for art and "he supported the cause loyally, though exhibitions at the festival often raised his ire over the decades.
BBC: NEWS | UK | Wales | North West Wales | Tributes for 'iconic' Sir Kyffin
The 25 mile route started at the Old Eisteddfod Field at the Millennium Coastal Park.
The 10-week consultation period will be launched at the National Eisteddfod at Llandow in the Vale of Glamorgan, with variety of options open to those wishing to share their views.
The report said that if the Newport eisteddfod lost money as predicted, it could put the future of the festival in jeopardy.
BBC: NEWS | UK | Wales | North West Wales | Eisteddfod's future 'in jeopardy'
Organisers say the National Eisteddfod can be traced back to 1176 when it is believed that the first festival was held by Lord Rhys, at his castle in Cardigan.
At the entrance to the National Eisteddfod last week, among a series of portraits depicting famous inhabitants of the Vale of Glamorgan, between Wing Commander Guy Gibson of the Dambusters and Olympic cyclist Nicole Cooke, was Carwyn Jones' predecessor Rhodri Morgan of Michaelston-le-Pit.
The National Eisteddfod could move between two permanent bases in addition to visiting temporary venues as part of proposals to modernise the event.
Cardigan Castle, the site of the first eisteddfod in 1176, is currently undergoing a major renovation.
In Llangollen, in north Wales, the International Eisteddfod is held annually bringing together troupes from dozens of countries.
Major events including the Royal Welsh Show and the Urdd Eisteddfod were cancelled.
It went on to enjoy enormous success, with triumphs at the National Eisteddfod and regular radio and television appearances.
The next eisteddfod is due to be held in Denbighshire in 2013.
Thousands of adults and children planning to attend the Urdd Eisteddfod next month are being urged to make sure they are vaccinated against measles.
The Urdd Eisteddfod claims to be Europe's largest arts youth festival, with thousands of young people from across Wales visiting the event every year for music, dance, performance, art and poetry competitions in the Welsh language.
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