This is not possible simply with native functions, at least not with ones I know. What you're doing is called STRING CONCATENTATION, even though your concatenation delimiter is a linefeed, it's still the same thing...concatenating multiple matching criteria into a single cell separated by a delimiter.
Fortunately, there are many string concatenation UDFs out there (User Defined Functions).
I installed Chip Pearsons "StringConcat" UDF into your sheet, then edited it to act the way you want, that is showing datevalues in MM/DD/YY format.
I renamed it DATECONCAT() and here's the code:
It's used as
=DATECONCAT(Delimiter,ArrayFormula,ResultRange,NullResult)
The formula I used in C2 was:
=Dateconcat(CHAR(10), IF(INDEX('Paste SFHS'!$A$2:$A$9&'Paste SFHS'!$B$2:$B$9,0)=A2&"08-Wave/Stu. Goals",'Paste SFHS'!$C$2:$C$9, ""))
That's an array formula, so must be confirmed with CTRL-SHIFT-ENTER to activate the array.
Here's your sample sheet back with the UDF in it and working. Notice it is now a .xlsm file, required for the added in UDF.
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