I've never even been in the church itself, I'm writing only about its carillon (which is actually owned by the mairie next door, though it's built into the church tower) and the carillon concert.
There's a legend, quite possibly untrue, that the bell of St-Germain l'Auxerrois was used as a signal to begin the St. Bartholomew's day massacre in 1572, but in any case that bell had nothing to do with the modern carillon.
Every Wednesday there are two little concerts played on the carillon, at 1:30 and 2:00 pm. You can hear it quite well sitting on the benches in the yard in front of the church, and watch a few Parisians who have come also to sit on the benches and listen to the concert while eating their lunch. You could probably also hear the concert well sitting at the outdoor tables of the pub-like place on the corner, but I didn't try it.
The purists hate this carillon because it's played (at the moment) through an electronic keyboard hookup, and musicians and carillonneurs hate it because the bells are in terrible condition, but if you've never heard a carillon concert, or if you know nothing about music (like me), you'll enjoy it.
Before (or after) you listen to the concert, you might want to go to the reception desk of the mairie next door and ask for their free almost-brochure on the history of the carillon. I think that they have them is several languages.
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