I kid you not my neighbor has been using a visitors pass for his work truck for at least 4 years. I've only ever seen him get a ticket once.

If you are near a shopping or holiday activity hub they are more likely to get tickets than in the middle of a residential neighborhood.

How often do you see tickets on your street? I have lived in the same apartment for almost 20 years and i have so rarely seen them patrol the residential parking here that I would just risk it and offer to pay if my guests got a ticket. Move the car every day, and if they get a ticket then find an alternative for the rest of the visit.

Edit: if you can't find anyone to move it for those 7 days you should park in a garage. Construction is unlikely as are moving vans this time of year, but a snow emergency isn't out of the question. You can't leave a car unattended for 7 days, permit or not.