Cancer costs the average patient in Wales £640 a month, in lost wages, travel to hospital, new clothes and adaptations to their homes according to the charity Macmillan Cancer Support.
Leeann Stroud of Bridgend says transport costs alone for her mother ran into hundreds each month.
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The Plaid leader urged voters to give her party a mandate, so that she can give Wales a voice in Parliament as the SNP has for Scotland.
90,000 people are expected to attend the youth festival, which runs from the 29th May to the 3rd June.
Heavy, thundery showers will clear northwards through the morning, allowing it to turn mostly dry and bright for many.