Love this thinking. As a Developer Advocate, I struggle to find a maintained list of not only CFPs but also developer conferences to consider for sponsorships.
For CFPs, one thing I've found useful is the cfp land twitter feed: twitter.com/cfp_land There's a website also, but I haven't used it much. Also, there's twitter.com/mozTechCFPs
Nice job with this! I'll be listing a Heroku job opening shortly (sneak peek).
And I just found this! cfpcalendar.com/ which covers CFPs but something similar for the actual conferences: airtable.com/shrR7hf53OElntauf/tbl...
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