To get together with friends, in English you would say "to have a get-together" or "to have a gathering." This phrase comes from the verb "to get" which means "to become" or "to come together," and the noun "together," which means "in each other's company." Here are some example sentences:

Let's have a get-together at my house this weekend. (让我们在这个周末在我家聚会吧。)

We're having a gathering on Friday night to celebrate John's birthday. (我们周五晚上要聚会庆祝约翰的生日。)

I'm looking forward to our next get-together. (我期待着我们下一次聚会。)