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Per this great post by Helen, my top ways to make and keep mom friends as a young mom (some don’t apply if you have a brand new infant). Let me know if you have others!!
Go to library baby time
Go to the mom group at church/temple/mosque/community center/etc.
Go to local playgrounds with your kids and talk to people
This is for unbounded retention. You can see the activity date is set as a range :
AND (n.signup_date + interval '30 days') >= a.activity_date -- retention data for the next 30 days after signup
For X-day you would have to define a specific activity date, for example:
AND (n.signup_date + interval '30 days') = a.activity_date
line #36:
https://gist.github.com/ks--ks/446e6d78e8a49048d4eabf55c3363309