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Pentacost was a special miracle intended to establish a far-flung group of ancient churches, to plant the seeds of Christianity throughout the Roman empire before Jerusalem was destroyed.

I would not forbid private worship practices, even tongues. However bringing those into Baptist services isn't included in that. We Baptists believe in Baptist liberty but that is not a license to ignore what the Bible clearly says about the results of speaking in tonuges (conversion of foreigners by preaching in languages the speaker does not know).

Are you trying to say that the Day of Pentecost was the only time that speaking in tongues was useful or acceptable?

Maybe you could attempt to explain also the speaking in tongues that occurred by new believers not the one preaching (Peter)

Act 10:45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.
Act 10:46 For they heard them speak with tongues, and magnify God...

Peter understood that Cornelius and his household had received the Holy Ghost because he heard them speak with tongues.

BTW Pentacost= Pentecost.