What we do During school holidays Additional Activity Days Throughout the school holidays, we run additional dates for our Activity Days on each Thursday of the holidays (see Activity Days for criteria and costs). When: Each Thursday during the school holidays between 11am-3pm. Cost: £8 for the first child and £4 for each additional child. Booking is required - booking opens at 9am on the Monday of the week you wish to attend. For details see our Holiday Activities page.