The release of the brothers is recorded in verses 15 and 16, where those who were left on the hill are also brought to the city to join in the celebration. Limhi does indeed proclaim a gathering and requires that his people gather to the temple. This is another touch that conforms to Mesoamerican practice. The Mesoamerican temples were accompanied by a courtyard space in front of them where the people might gather to witness events on the temple. In many cases, these areas were acoustically designed to improve the ability of the gathered people to hear.
The most important information in these verses comes in verse 15, where Limhi gives the reason that they are so happy to connect with Zarahemla again. They are currently burdened with heavy taxes from the Lamanites and see the connection to Zarahemla as their salvation. The conditions are sufficiently bad that they assume that even being slaves among the Nephites would be better than their current conditions. That statement is probably hyperbole. We have learned that Benjamin had not suffered that the Nephites have slaves (see Mosiah 2:13), so Limhi could have been aware that there were no slaves among the Nephites.