Imam Sadiq ('as) has said:
The Holy Prophet (saw), initially observed the I'tikaaf (spiritual retreat) during the first ten days of the month of Ramadan. Later, he observed it during the middle ten days of the holy month and finally, he observed it during the last 10 days of the month and then continued to do so in the last ten days (for as long as he was alive).
Bihar al-Anwar, vol. 16, pg. 274
This year’s I'tikaaf will be held from this Saturday 25th to Wednesday 29th June for males from the age of 18 years and above.
For those between the ages of 16-18, in order to take part, they will have to be accompanied by a parent/guardian.
Please note that registration is required if you would like to participate.