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On the second Saturday of each month, the South Acton Congregational Church opens its doors to the community so people can listen to a concert, watch a magician or hear stories from a horse whisperer. The new “Second Saturdays’’ entertainment and educational series is not about religion or drawing new people into the congregation, said Katrina Wuensch, minister of the church. Instead, it’s about using the building on School Street as a “third place’’ outside of work and home where people can get together in a social setting.