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So, the issue is not that the cells show ####, but that the formula returns FALSE, right?
Well, the formula returns FALSE if the condition of the IF statement is not met.
Without seeing your data it is not possible to suggest how to fix that. But if you get a FALSE, then there is no cell in 'Special Events'!$K$4:$K$15='Daily Planner'!$B$14, because you don't specify a FALSE option for that IF statement.
Here is where the FALSE option needs to go:
=IF('Special Events'!$K$4:$K$15='Daily Planner'!$B$14,IF('Special Events'!$J$4:$J$15='Daily Planner'!$E$4,'Special Events'!$L$4:$L$15,"-"),"oops, something went wrong")