Actually there was two exchanges, at the very first day of the event just in the starting minutes when I entered the game and go to exchange, I saw a 50 candace roll exchange offer with universal tokens ( 5 for each) , I wanted to do it but I didn't have enough uni tokens that time ( u needed 250 for all 50 tokens) so I skipped that time and thought I'll do it later but when after 2 hours I return to game i saw that exchange disappeared without any context, I didn't get what actually happened. I guess next day i saw another exchange for candace rolls with uni tokens but it was only 20 rolls with 5 uni tokens for each roll again. But now the thing is many used that glitch and even already completed the first week of the event, so what's about the others who didn't know it or can't utilize? They should be compensated