From Isman:

MONTH of the ANCESTORS

Brothers and Sisters,
We are now approaching the month of the ancestors, which begins Sunday, May 8th. According to Bapak, this is the month that God allows our ancestors who are spiritually developed to visit us in this world. This is the month before Ramadan, which begins in North America on June 4th, which is the new moon and the first night of Ramadan. The first day of fasting is Sunday, June 5th. May Almighty God bless all of us who are fasting . Amin!

For those observing the fast of Ramadan
Explanations of the Ramadan Calendar
Compiled from explanations given by Bapak, by Mas Sudarto and by Mas Prio
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Eve of Ramadan: The way to observe Ramadan is to take a full bath, including hair washing, and also cutting the hair and the nails, the evening before the fast. Then, after you are clean, to state your wish to observe Ramadan as a sincere expression of your worship of Almighty God. Then stay up at night, preferably spending the night together with other Subud brothers and sisters, in the home of a member who is also observing Ramadan.
Around three o’clock in the morning, you should take breakfast and you should brush your teeth no later than 4:30 in the morning, and after this, no more smoking, not even gargling till 6:30 PM or 7:00 PM – along about sunset. (The local mosque can clarify as to the hour for breaking the fast.)
To break the fast, start slowly by drinking warm tea and a light snack; you can eat your dinner about half an hour or an hour later. Bapak also recommends no sexual union during the whole month of Ramadan. It is also beneficial to sleep as little as possible during Ramadan, not only on Nights of Power.