I can't reacall it in every detail, but I know Geralt and Dandelion (Jaskier) were by coincidende in the same festival. Dandelion, as anyone can imagine, was flirting (and even more If my memory serves me well) with some girl, but she was the wrong choice, as she had some big angry brothers... So, as Dadelion was running for his life, he met Geralt, and sticked to him during the whole party. And, as Dandelion says, he was happy of saving his ass, and Geralt was too happy of having another company that wasn't his horse, or something like that. I don't know how it's said in English.