=SI(ESTNA(EQUIV(D6;DECALER('Meeting allocations'!$A$2;
EQUIV($C$3;'Meeting allocations'!$A$3:$A$181;0);;;28);0));"";
INDEX('Meeting allocations'!$A$1:$AC$1;EQUIV(D6;
DECALER('Meeting allocations'!$A$2;EQUIV($C$3;'Meeting allocations'!
$A$3:$A$181;0);;;28);0)))