I would just take the brute force approach
=IF(ISNA(VLOOKUP(B2,Sun!A:BN,2,FALSE)),IF(ISNA(VLOOKUP(B2,Sat!A:BN,2,FALSE)),IF(ISNA(VLOOKUP(B2,Fri!A:BN,2,FALSE)),"",VLOOKUP(B2,Fri!A:BN,2,FALSE)),VLOOKUP(B2,Sat!A:BN,2,FALSE)),VLOOKUP(B2,Sun!A:B,2,FALSE))
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