Hello @JamesA599. Good question! It looks like you may have already talked to a member of our Support team about this but I did want to reply here as well in case another customer had a similar question. If you are using our Event tool to send out event invitations, we are not able to send out an email to non-respondents for multiple events at one time. If you did want to contact these non-respondents, you would have to manually determine who has not responded and create a contact list for them.