I apologize for temporarily going off topic here, but as someone who has been on the receiving end of such a meal calendar, THANK YOU. Whatever you do will be so very appreciated.
I know that for me, simple was the best. I could handle baked potatoes, rice, simple grilled veg that I could eat either hot or cold. I couldn't handle meat, but the couscous a PP described would have been great.
For the rest of the family, they could eat spicy things, casserole things, anything, really. I think chilled salads, maybe rice based, would go well with the grilled meats and salmon burgers you are already planning.
I hope this helps.