If your city or university doesn't already have an effective altruist group, you can just start one. If you're interested in this, get in touch. At its most minimal, it can simply involve being listed as someone that local people interested in effective altruism can get in touch with.
We'll give you guidance and helpful resources. We've written several modules on different topics which you can use to host events or discussions. And we've also compiled a launch manual that has a detailed walkthrough of all of the important steps, plus some other material you may need from time to time:
See also the resources and guides for local groups on the EA wiki.