One World Probability Seminar: https://www.owprobability.org/one-world-probability-seminar

One World PDE Seminar: https://people.bath.ac.uk/mw2319/owpde/

Waves in One World: https://sites.google.com/view/waves-ow/home

One World Mathematical Game Theory Seminar: https://sites.google.com/view/one-world-game-theory/home 

One World Seminar: Mathematical Methods for Arbitrary Data Sources (MADS): http://www.nonlocal-methods.eu/oneworld/

One World IMAGing and INvErse problems Seminar (IMAGINE): https://sites.google.com/view/oneworldimagine

One World Optimization Seminar: https://owos.univie.ac.at/

One World Actuarial Research Seminar: http://www.maths.usyd.edu.au/u/munir/owars/

Approximate Bayesian Computation One World Seminar https://warwick.ac.uk/fac/sci/statistics/news/upcoming-seminars/abcworldseminar

Directions to even more worlds