Unfortunately, this is not a valid due date formula. Please set two tasks with the same name, one to "ev 1st tue" and the other to "ev 2nd tue".
Is there a way to copy tasks and bring notes along?
There is no direct way to copy and past tasks (with or without notes) in Todoist currently.
You can right click on a project and choose "Export as Template" and this will export everything so that you can create a new project with the same tasks.