Lookup and return multiple values concatenated into one cell

looking for a formula that will evaluate all dates from column D on worksheet 2 if all dates from D3:D10 are equal to D2 then set the value of cell C4 on worksheet 1 to ALL else if the dates do not equal D2 then match the values from column B on worksheet 2 where column D dates do equal then concatenate the values from column B to cell C4 on worksheet 1.

A sample file is attached with an illustration of the desired outcome. Thanks for checking this out!