If you're talking about the moment when Monika starts giving out tasks to the other members for the festival preparations, it doesn't do anything AFAIK. The only thing that happens is Yuri and Natsuki will start an argument with her, stating how Monika basically had the easiest task that could've been done with one person instead of two. They got furious about it, which led to Monika asking the MC to choose someone else to help out.
Before making this choice, you can always save your game first and then see what happens for yourself if you don't believe me.
