Veroveraar

No you cannot attempt to cast an spell a second time (in a turn) whether it is successful or not. There are some minor exceptions to this for the ossiarch bonereapers (soulmason) and for Arkhan and Nagash. But other than that there are no ways to (attempt) to cast a spell more than once.

I came across one tournament being organized in the Netherlands: if you look on facebook for Dutch grand Tournament, there is one being organized by alliance open. That is a two day tournament end of February in the schiphol area, but that is also the only one I have been able to find at all.