How do RunDisney events affect crowds?

invalid@example.com (MegRuss626), MegRuss626
Mon, 19 Aug 2019 19:59:27 +0000
WDW Meetups

We're toying around with a long weekend trip for April 16-19, 2020 and I just saw that it is the Star Wars run event. I’ve never been during a run event and wasn’t sure how they affected the crowds in the parks? Thanks!