Offset Problem

I'm trying to have a list of event sponsors automatically generate from the full RSVP list. I copied my formula from another spreadsheet that works perfectly and modified it for the sponsor criteria instead of the original date criteria. It worked when I had one sponsor on the second line, but failed when I added another sponsor to the list. Some experimentation reveals that it works as long as I have sponsors only on the first two lines, if I add a sponsor anywhere else, it fails. I can tell from running Evaluate Formula that the failure is caused by the offset section of the formula, but I can't figure out how to fix it. I tried changing the COUNT reference from the actual section to the full column as in the original, but that made no difference. The current and original formulas are below and a sample workbook is attached. Thanks in advance for any help.

Current formula (Music!A9:A21 on sample):
{=IFERROR(INDEX(Attendees!$A$3:$A$23,SMALL(IF(Attendees!$F$3:$F$23<>0,ROW(OFFSET(Attendees!$A$1,0,0,COUNT(Attendees!$A$3:$A$23)+2,1))),ROWS($A$9:A9))),"")}

Original formula from another sheet:
{=IFERROR(INDEX('All Donations'!$A$7:$A$26,SMALL(IF('All Donations'!$C$7:$C$1623>=(EOMONTH($B$3,-1)+1),IF('All Donations'!$C$7:$C$1623<=$B$3,ROW(OFFSET('All Donations'!$A$1,0,0,COUNT('All Donations'!$A:$A)+6,1)))),ROWS($A$26:A26))),"")}

Thanks, but there is header data in rows one and two that needs to be ignored. And the actual entries in column F are one single character; in creating the sample, I reduced all text to initials.

Sorry, typing too fast, I missed the word 'not'.

the actual entries in column F are NOT single character

Thanks for your input, it didn't address the need for the offset, but it did keep me thinking and I finally solved it using "-2" instead of using the offset function as shown below.

Formula with Offset function that failed:
{=IFERROR(INDEX(Attendees!$A$3:$A$23,SMALL(IF(Attendees!$F$3:$F$23<>0,ROW(OFFSET(Attendees!$A$1,0,0,COUNT(Attendees!$A$3:$A$23)+2,1))),ROWS($A$9:A9))),"")}

New Working Formula:

{=IFERROR(INDEX(Attendees!$A$3:$A$50,SMALL(IF(Attendees!$F$3:$F$50<>0,ROW($A$3:$A$50)-2),ROWS($A$67:A67))),"")}