1 Cor 12:28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
Mark 16 does indeed use the word tongues, but because of the stigma here, lets use languages because glōssa simply means language. We will speak in new tongues.... since coming to the Lord I have advanced beyond English and can read and speak Hebrew. Isn't that learning a new tongue? How you praise the Lord is between you and the Lord, but the idea that speaking in tongues is expected or is what being baptised into the Spirit means is not Scripture. It is the bias you were raised in shining through the text.
As for Luke 2... no... messiah himself is the sign. Simeon knew of the prophecies of the coming mashiach (messiah/anointed one) and when he saw him he knew it was a sign that many prophecies were about to come to pass.
"Behold, this Child is destined for the fall and rising of many in Israel, and for a sign which will be spoken against.
It was the child who was the sign, not tongues.