Depending on what kind of crowding and deblending you’re interested in (e.g., point source vs. galaxies/extended, and what order multiplets), the DESC blending working group (BL WG) may be a good resource. A lot of work from various groups gets reported and discussed at the BL WG telecons, and the BL WG web site archives slides and notes on that activity. BL WG also organizes sessions on galaxy deblending at DESC and wider LSST meetings. At least so far, this work is mostly focusing on low-multiplicity blends (at 10-yr depth, many LSST fields will be “crowded” in the low-multiplicity sense), but I would guess some of the methods and insights would be relevant for highly crowded fields. I’d link to their web page, but it’s on DESC’s Confluence site at SLAC, requiring DESC membership to access. Those interested specifically in galaxy deblending might consider joining DESC and the BL WG.