Integration to visit Brunei during these festivals should not eat any drink. In front of them during periods of fasting as well, because it is a reasonable action, especially.
The group you are visiting Brunei during such drinks should not eat any food. Their presence during fasting there as well. Because no action shall be deemed more worthy.
If you visit to Brunei during the festival should not drink eat any. In front of them during fasting there as well. Because it is the act that is not appropriate.