It is time to build the Tabernacle, that structure which will hold the ark which will hold the words of God. So, our Torah portion begins with Moses gathering the people together to begin the process. Like we read a few weeks ago, everyone who wishes may make a contribution. Bezalel is charged with constructing the Tabernacle. And all the details of that construction are laid out in these waning verses of Exodus.
Every synagogue is known as a kehillah kedusha - a holy community.
The exodus from Egypt was arduous. People were scared of the Egyptians following and the Sea of Reeds in front of them. They survived only to be short of food and drink, and long on complaining. Then the Golden Calf episode confronted them. In order to move forward, Moses had to bring people together, to feel as though they had ownership of the whole Sinai experience.