This makes sense

From Lisa Kennelly:

Those grounds crew guys just came out to take the tarp off, when it started raining. Riiiiight. So now the estimated start time is 4:20. Stay tuned.

Update: Well now I just have no idea what's going on. It's raining harder, but the tarp is being removed. Makes perfect sense, right?

So if you're just turning on Fox and you're confused as to why the Cubs/White Sox game is on, this is the reason.