I was pondering the future value of advertisements on the live broadcast of the inevitable eventual Mars landing, and it led me to wonder about this.
It very much depends about which country you're asking. I am Dutch, in those days we didn't have advertisements in programs. Only short blocks before and after the news. 'American' in-program advertisements and 24/7 broadcasting came much later, mid or late 70's, if I recall correctly.
As far as I know in 1969 in-program advertisements, certainly for a major event like that, were not done. It would probably have caused an outcry back then. We have digressed/progressed (pick your choice) a lot since then.