We have recently been working with a number of our eCampaign customers to develop a complete solution for Event Invitation Tracking in CRM.
So what is Event Invitation tracking, in some circumstances your organisation many want to send customers an invitation to attend a webinar or an event that is being held, and track the responses in CRM to create a list of contacts that wish to attend,
We have done this in the following way by adding new entities to CRM for Event and Event responses
PIC EV 1

On the creation of an event in CRM, two URL’s are created for the Accept and Decline process and these can be used in eCampaign to send a bulk email with event invitations.
When a recipiant recieves the email they will have two options, below is an example of an email for an event in eCampaign
PIC EV 2

When a recipient selects the Accept button from the email they will be taken to your event page which details the event and will display a message saying they have opted to attend
PIC EV 3

Likewise if the recipient Declines a similar page is displayed with a message saying they are not attending.
PIC EV 4

For more information on eEvent and Invitation tracking please contact sales@mycrmgroup.com or register with http://downloads.mycrmgroup.com/
Thanks Alisatir