This is what it says on the Embroiderers' Guild website, and I couldn't have put it better myself:
Following the success of the National Celebration of Stitch in 2014, some of our Branches will again be holding events around the country on or around 1st August 2015 to raise awareness in the local area of their branch, the delights of stitching, textiles and embroidery.
Events in Yorkshire can be found by clicking on this link. Many of the events are taking place today, the 1st August, but others are happening later in the month.
Do check with the venue before travelling to get further details. Admission charges may apply in some cases.