Stuart Vincent's try helped Ilkley defeat holders Stoke in the RFU Intermediate Cup
Yorkshire Day is officially August 1 but Twickenham will be taken over by the white rose hordes on Saturday, May 5.
RFU Junior Vase finalists Baildon will be joined by Ilkley and Wath in the RFU Intermediate Cup and RFU Senior Vase respectively.
Ilkley, watched by a crowd of 1,100, defeated holders Stoke 24-20 with an Iain McKenzie try three minutes into stoppage time.
Other tries for the Dalesmen came from No 8 McKenzie and Stuart Vincent, Phil Howell adding three conversions and a penalty.
They will meet East Grinstead, who beat North Bristol 58-3 in the final.
Wath, 52-7 victors over Stourbridge Lions, will play Wells, from Somerset, who won 14-8 at Maidstone.
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