I can't currently switch between the Icerun event and crafting event activity tabs. I've tried on both my Kindle tablet (Silk browser)and my PC (FireFox), so it seems to be a site rather than device or cookie issue, but I could be wrong since no one else has reported having any issues.
I keep pressing the swap button and it just greys out and does nothing, so I can't see my progress on or collect my rewards for last tier of Crafting Caravan.