The GEE (Galaxy Evolution and Environment) meeting series is aimed at bringing together the Italian astronomical community working on this field to discuss ongoing projects and foster new collaborative efforts. Following this tradition, GEE6 will be held on October 28-31, 2019 at the Adriatico Guesthouse in Trieste.

The focus of the sixth meeting of the series will be on the close link between the evolution of galaxies and the assembling of cosmic structures: observed properties of galaxies have long been known to depend on the `environment' in which they are located. Despite much effort, however, disentangling the environment(s) and the related physical processes that are responsible for the observed trends has proved difficult. Usually, the argument centres on whether these trends are the end product of physical processes coming into play after galaxies have become part of a `group' or of a `cluster' (the `nurture' hypothesis), or whether they are established before these events take place, because of galaxy formation proceeding differently in overdense regions (the `nature' hypothesis). In the current standard cosmological paradigm, this controversy appears ill posed, as these two elements are inevitably and heavily inter- twined: dark matter collapses into haloes in a bottom-up fashion with small objects forming first and later merge into progressively larger systems. As cosmic structure grows, galaxies join more and more massive systems, therefore experiencing different environments during their lifetimes.

This meeting will bring together the observational and theoretical italian community working on galaxy evolution and environment, with the goal to:

(1) discuss results from major ongoing observational programmes in the framework of current state-of-the-art theoretical models;

(2) tighten the link and collaborations between the observational and theoretical italian communities working on the subject, and establish an effective coordination among various observational programmes;

(3) examine strategies for follow-up projects, and exploitation of data available from independent programmes;

(4) consider optimal strategies for new instrumentation and for planned surveys (e.g. Euclid, MOONS, SKA, JWST).