Does Acts 13:15 imply the synagogues were very social and allowed strangers to speak to the congregation?

I never noticed before but I have wondered how the Apostles were always freely given the opportunity to preach in the synagogues? In our modern day churches (aside from some charismatics) allowing someone not well known to speak to the congregation is almost unheard of. The verse that came to my attention is Acts 13:15 Acts 13:15 ESV > After the reading from the Law and the Prophets, the rulers of > the synagogue sent a message to them, saying, “Brothers, if you have > any word of encouragement for the people, say it.” Does this mean strangers who visited other churches (who appeared normal I guess?) were commonly given a warm hand of fellowship and offered to share? Are there any other scriptures indicating an affirmative or negative to this idea? Not sure if this relates to the free ability to publicly raise questions? For example, Jesus at the temple as a child. I can’t imagine how a child (not allowed to speak of course) could yet be able to debate or ask questions with the pastor of a modern church? Not sure what it is but something seems different.