Here is one perspective of the Siyum HaShas from yesterday:
You can read this article and the many others that are out or coming out this weekend about the exciting conclusion to this Torah learning experience. I find it personally interesting that many people found the tefilla experience at the siyum to be the highlight (and I am not speaking about the upper deck mechitza that was put in special for the evening - one tweet: New York siyum set a Guinness World Record for largest mechitza. @adamkaroly).
Although the activity of Daf Yomi is considered more about Torah learning - take note that the davening was seemingly as uplifting as the great, inspirational speeches within the stadium. I was not there - but wonder what it would have been like to mark such a great accomplishment of study, together with nearly 100K other Jews, and not to have prayed?
We have the power to daven almost anywhere - the only prohibitions are for locations that are 1) near feces or urine 2) near an object that is an anathema to our religion, and c) overly distracting - otherwise we can make anyplace a synagogue. If you were there - what was it like to have Giants stadium full of Jews? Will the 2020 siyum be larger?