What happened in the ten days between Ascension and Pentecost?

Between Ascension and Pentecost, the surviving eleven apostles replaced Judas and appointed the 13th apostle. This is the story ...

What happened in the ten days between Ascension and Pentecost?
Between Ascension and Pentecost, the surviving eleven apostles replaced Judas and appointed the 13th apostle. This is the story ...