Here is where you can find many different kinds of events. There are conferences and conventions held annually by national organizations and local state and regional groups. There are also events held for youth, and secular celebrations that might be observed in many different ways, either by local groups or by families and individuals.
Additionally, local groups are coming together all across the country to engage in monthly meetings, social events, and community service projects. Find a group near you to see what they might be up to.