Acts 15 is very instructive for what God required of the Gentiles. The Judaziers thought new believers had to be circumcised, just like the Jews were. After much discussion, Peter says,
"After there had been much debate, Peter stood up and said to them, “Brothers, you know that some time ago God chose me to preach to the Gentiles so they would hear the message of the gospel and believe. 8 And God, who knows the heart, has testified to them by giving them the Holy Spirit just as he did to us, 9 and he made no distinction between them and us, cleansing their hearts by faith. 10 So now why are you putting God to the test by placing on the neck of the disciples a yoke that neither our ancestors nor we have been able to bear? 11 On the contrary, we believe that we are saved through the grace of the Lord Jesus, in the same way as they are.” Acts 15:7-11 NET
God does NOT want to have a heavy yoke on the Gentile believers, because the Jews themselves were not able to keep the laws. So, the first Jerusalem Council hammered out an acceptable scheme for Gentile believers to follow. Please note that the Sabbath is NOT mentioned.
"For it seemed best to the Holy Spirit and to us not to place any greater burden on you than these necessary rules: 29 that you abstain from meat that has been sacrificed to idols and from blood and from what has been strangled and from sexual immorality. If you keep yourselves from doing these things, you will do well. Farewell." Acts 15:28-29
As you can see, 4 things only were required of the Gentiles:
1. Meat sacrificed to idols (later Paul spoke against that, in 1 Corinthians 8, which is too long to quote here!)
2. Blood
3. What has been strangled
4. Sexual immorality
So, no burden, abstain from the above 4 things. I think if God had wanted Gentile believers to continue celebrating the Sabbath as the Jews did, there would have been no better time, than the Jerusalem council, which discussed the law, and stopped the Judaizers from pressuring the Gentile believers to do something God did not require. The Sabbath and circumcision are not on the list. Therefore, we do NOT have to celebrate the Sabbath according to Jewish law. And I guess the men can celebrate they don't have to be circumcised to be a believer!
End of discussion!