Sporting stars last night played a special football match to raise money for a charity set up in memory of April Jones. Players such as former international Chris Coleman lined-up to play Machynlleth FC.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.