Once again look at the passage not just the verse. It tells you things that will happen.
“These people ar en’t drunk, as you suppose — it’s only nine in the morning.No, this is what was spoken about through the prophet Yo’el:‘Adonai says: “
In the Last Days, I will pour out from my Spirit upon everyone. Your sons and daughters will prophesy, your young men will see visions, your old men will dream dreams.Even on my slaves, both men and women, will I pour out from my Spirit in those days; and they will prophesy.I will perform miracles in the sky above and signs on the earth below — blood, fire and thick smoke.The sun will become dark and the moon blood before the great and fearful Day of Adonai comes.And then, whoever calls on the name of Adonai will be saved.”’ - Acts 2:15-21
Bible Gateway passage: Acts 2:15-21 - Complete Jewish Bible