"Scheduling conflicts" refers to a situation where two or more events or tasks are planned for the same time, making it difficult or impossible to attend or complete everything as intended. Full definition
As I had to cross off one race after another because of scheduling conflicts with other events in my life, I started to get more worried. (scoobysworkshop.com)
However, they do this so that kids can get access to classes not offered at their base school or because of scheduling conflicts so no child only has online classes. (voices.washingtonpost.com)
This could cause scheduling conflicts for whichever actor eventually lands the role. (cbr.com)