Nothing beats witnessing some of the amazing events and festivals that happen around Borneo, namely in Sarawak and Sabah. One of the most recommended would be the local Harvest Festival or Gawai Festival which takes place every June throughout Sawarak while over in Sabah, it is the Kaamatan Harvest Festival that takes place every May.
Apart from these two large scaled state wide events, there are many other events and festivals throughout the year with many different types of ethnic races celebrating them. Most of the major events take place in the larger cities like Kuching, Miri and Sibu while smaller more unique events will take places in the smaller villages. Various music festivals are also on top of the list in Borneo too. It is highly recommended that you consult your tour company on the actual timings to plan your trip for this. You can also customize your itinerary with Planet Borneo Tours in coinciding your travel with some of the events.