I want to send some emails to specific partners. These emails will be invitations to events.

In the tree view of partners, select a specific group of them (clicking on the checkbox which every tree view has) and click on send mail. This action opens a popup. In this popup there is the option to select a template for filling in the email, but only the templates whose property model_id is res.partner are available. And if I declare a template with the property model_id = res.partner, I won't be able to use properties from the event, like the name, the date or the place.

I don't think that creating an intermediate table will be a possible solution, because I need to enable the possibility of filtering by any res.partner property before sending the email. But the template must have information about partners and events.

Can anyone explain me how to achieve this? Is it possible to merge models in a template, to get data from both?