Bydd y Tywysog Charles hefyd yn cyflwyno darnau arian arbennig y GIG gan y Bathdy Brenhinol i'r plant o ysgolion cynradd Cymru a enillodd cystadleuaeth arlunio GIG70.
Prince Charles will also present special NHS coins from the Royal Mint to primary school children from across Wales who won the NHS70 drawing competition.