I sure thought this would be easy, but I keep getting exceptions on every line stating

Line 1: Required Field Missing: Name [Object: 'CParticipant', PK: '-1', Import ID: '', Desc: '', Field: 'Name', Value: ''] -->BBREAPI.CParticipantClass.Save()-->#=q8ewjuR167MPG1NKDGdOVfZj8OFlHN0pfocoICyxTrsM=.#=qVfk0Hzrx29gx_2JQfWOrMQ==()

All I want to do is change the Print Name Tag to from "Yes" to "No" in RE.  My csv file consists of the following

Constituent ID	Print Name Tag	Participant Name	Event Name	Event Import ID
20	No	Daniel J. Murphy	0905 FOMI Luncheon	01638-596-0000000012

I only have these 2 fields configured, the rest are ignored.

Seems like it wants a name, I suspect because you are not specifying which participant is to be updated, just giving it the event ID instead of a participant ID?

Thanks Wayne.  I mapped the Constituent ID (which is the participant) but I get the same error.  I'll go search for the participant id and re-configure the profile.

Well, I can't seem to find a participant id.
I mapped:
A Constituent ID Constituent Field ID
B Print Name Tag Participant Print Tags
C Participant Name Participant Name Tag Text
D Event Name Ignore
E Event Import ID Participant Import ID
F Event ID Participant Event ID

and although I didn't get any errors, it didn't update anything either!
Back to the drawing board.

DOINK to me!!!! I forgot to change the Yes to No....it worked after that!