See
https://www.pugski.com/forums/gatherings-and-on-the-hill-meetups.17/
This year's Gathering is at Jackson Hole the last week of February which means it there is not new snow a lot of the mountain can turn to Spring conditions due to elevation and exposure. But there will be enough local knowledge that even without new snow there should be someone there to guide you to good snow.
My Gathering history:
2012 - Late Feb when Phil and Tricia got married on a powder Leap day. After a long drought CA got dumped on beginning with the first day at Mt Rose
2013 - I think it was Big Sky and I didn't go
2014 - UT, the first week of Feb and I did not stay the whole week, but my notes show I skied new snow 3 of my 4 days. 2nd Gathering at Mammoth and Tahoe late March with storm the last day at Mammoth and first day at Tahoe.
2015 - Jackson Hole. See my post on preceding page in this thread
2016 - Aspen first week of Feb with some new snow, but don't think it was that much
2017 - Whistler in early March with new snow every day I was there down to Village
2018 - UT early March started with two powder days at Snowbasin, then
2019 - Big Sky with new snow every day I was there
The additional comment to my preceding post recommending Altabird, Targhee and Lost Trail is that Altabird gets very busy, especially on powder weekends in middle of season. Weekdays are better with Tues/Wed probably best. Late season (April, early May) can be great with lower crowds although I'm usually not there. Brighton can be a good place to avoid worst of crowds and at any of the UT places having someone with local knowledge can make a big difference in quality of snow.