Multiple Lookups In Single Cell

I am looking for creating a dynamic meeting log/calendar for my team. There's a couple of elements to my questions below:

I have a log with columns such as "Meeting Date", "Client", "Attendee" and have also set up month calendars on separate tabs which automatically update the dates according to a "Year" toggle using Janoffset, Feboffset, etc.

What I would like to do is have these calendars automatically populate a cell beneath each date with any meetings on that day. The client name and then a space then the attendee in brackets would be sufficient and with each meeting having its own line in the cell).

I have gotten a Vlookup working but have run into two snags: 1) where there is more than one meeting on a single day 2) I can only return one piece of information in the cell or otherwise have it blank, I can't have the client name AND attendee.

Is there any way to lookup all of that information in the one cell or is this just a pipe dream?

I have attached my workbook which contains my workings so far and in the first cell of Jan shown the "ideal" format. I'd like the data in.