Passing concatenated text into a calendar

I am stumped. My skills aren't advanced though so that isn't hard. Basically I have a sheet with events that have stages with designated intervals. On day for stage 1, four days for stage 2, etc. I have a table set up that auto calculates due dates based on the initiation date. I want these deadlines to auto populate into the corresponding calendar cells. And here's the rub. I would like for it to say "Title Stage" in the date. So like "Event 1 Stage 2". I was hoping to pull the event title from column A and the stage from row 1. I may be approaching this all wrong because I cant find something that works for me. Anyone have a direction or formula combination they recommend I look at? I have attached the calendar I am working with.

The end goal is to have a workbook that I can put an event title and initiation date into and the deadlines auto calculate and the calendar auto populates with deadlines.