I just set up a interesting moment to show everyone that attended my event, at the same time I create an alert, set the 'Send To' to none and added two emails including my own to 'To Other Emails'. I just received 41 emails containing my alert (the amount that attended). I am worried that they also sent to the lead - its hard to tell in the results tab. Below is a print screen of when I see when I click on the 'sent alert' leads info.