Below is a summary for everyone about the last few years' initial JS1, JS1b and JS2 waves. I know there is usually some sort of trickle later, but I'm not including those dates here because they are awfully difficult to nail down and listing them wouldn't be useful to most people. (JESSICA: please do not interpret that as a reflection of my work ethic. Thx!)
Maybe OP can add this to the first post in this thread for convenience and for future reference...
2014 Waitlist (c/o 2017):
JS1: Tues 5/6 (interviews took place Thurs 5/8 and Fri 5/9)
JS1b: Tues 5/13
JS2: Thurs 5/15 (went to both those with JS1bs on the 13th and those with post-WL JS1s)
2015 Waitlist (c/o 2018):
JS1: Thurs 5/7 (interviews took place Mon 5/11 through Thurs 5/14)
JS1b: Wed 5/20
JS2: Wed 5/20 (yes, same day)
2016 Waitlist (c/o 2019):
JS1: Fri 5/13 (interviews took place Wed 5/18 and Thurs 5/19)
JS1b: unclear...I could have sworn I saw posts about it but can't find any, so I might be wrong. Might have been like 2015, when JS1b's seemed to either not take place or occur in the same call or on the same day as JS2's.
JS2: Wed 5/25 (seemed to mostly or perhaps only include post-WL JS1s)
Ding wave: Thurs 5/26
2017 Waitlist (c/o 2020):
JS1: Thurs 5/4 (interviews took place Tues 5/9 and Wed 5/10)
JS1b: Wed 5/10 (emails to pre-WL JS1s asking for updates about plans for the fall) and Thurs 5/11 (calls).
It was confirmed that some people who didn't send LOCI's got the email and/or the call, as did some who DID send LOCI's.
JS2: [to be updated SOON, G-d willing!]