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indico
Indico - A feature-rich event management system, made @ CERN, the place where the Web was born.
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Scout Monitoring
Rennaisance engineers rejoice! 1 gem 5 min to app monitoring. 5-minute onboarding. No sales team. Devs in the support channels. No DevOps team required. Get the free app insights every engineer deserves with Scout Monitoring.
As for the planning I'd probably use a project management tool. Usually I'm recommending simpler ones like Vikunja but for whole congresses I'd rather use something 'bigger' like OpenProject (installation doc and they are also on Reddit).
Take a look at Indico: https://getindico.io/
NOTE:
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Hence, a higher number means a more popular project.