What does Exodus 18:12 mean?

Then Jethro, Moses’ father-in-law, brought a burnt offering and other sacrifices to God. Aaron and all the elders of Israel came and ate with Moses’ father-in-law in God’s presence. Exodus 18:12 - Modern Text Bible

(Jethro worships God with sacrifices, and the leaders of Israel join him in a meal, celebrating together.)