Kirsty Williams AM, the Liberal Democrats leader in Wales, is accusing the Welsh government of not standing by its promise in 2006 that everyone who wanted to register with an NHS dentist would be able to do so.
She says a lot of people either can't register or are having to travel long distances.
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At the moment providing youth services is discretionary, but the former Children's Commisioner Keith Towler wants to change that.
The three day annual event, held this year at Caerphilly castle is expected to attract thousands of visitors.
Dramatic footage of a near escape on the train tracks has been issued as part of the latest rail safety campaign