Yes you are correct, I had asked in the original form. I made it clear if people wish to vote, they may do so. And some users took advantage of that and asked to be tagged, to which I compiled a full list and use it here. There was nothing in the signup form as it was started in the thread and people just commented that they would like to be tagged for the voting, such as the example below:
If they chose not to click on the thread to begin with, when the events members tag was used, they are basically saying they don’t want to be bothered with the event. Hence no need to tag them again as we are almost halfway through. There is no need to use the events members tag this late in an event: we would essentially be spamming tags that people don’t want.