Priestweston weekend at easter is allways Easter Weekend, ie. 18th to 20th of April this year if my Calender is correct. It's a good thing its that simple being a rather unorganised event.
There is a september weekend, which tends to be a little quieter/different , last year nobody got round to sorting out a date till about a week before with obvious consequences, ended up as an cosy little evening session.
   Hope we see you and many others at easter this year.
                All the best Nick