Ok, I went to this just to see what it was.
My hunch was right that it was treated as a Charismatic Mass and primarily advertised to the charismatic community here, not to everybody at large. I could speculate as to why the charismatics seem to want their “privacy” but I’ll skip it. It was mostly just a normal OF Mass with four “First Readings” plus psalms/ responses, plus there was an Epistle and Gospel for a total of 6 readings. Languages were alternated for the readings, which was okay, and even alternated in some of the prayers, which wasn’t so okay - I found that a distraction from prayer. The consecration was done in English, using Eucharistic Prayer 1, the long version.
I would attend a Pentecost Vigil Mass again, but I’d prefer it be all in English and not charismatic next time.