Vlookup and concatenate results - possible with formulas?

Thank you Glenn!

I attach an Excel file with a more real list.
It's in fact a list of writers signing books at bookshops. (it's St George day in Catalonia, a books festival)

I see your formula works if there are just 2 destinations and doesn't show nothing if there is a different number.

Our main problem is that the list is a work in progress. Editors and authors are sending new data every day, that we add to a master Excel file.
So we don't know how many 'authors' ('origin' column in the OP example) and 'places' (originally 'destinations') we will have in the end.

Thanks for your help!