I've had a couple of enquiries about this, so here is what I've been able to find out:
The organisers of the Mere Brow beer, wine and cider festival state that, following the huge success of their previous one, they will be repeating it on Saturday 13th July, between 10am and 2.30pm at Homestead Farm, Wiggins Lane, Holmeswood. You can reach the site using the 347 Southport to Chorley bus, but it might make sense to make an early start and finish, as buses leave Southport (on Lord Street near Morrisons) at 10.40 am and 12.25 pm, and the last direct bus back is 3.50 pm from Wiggins Lane.
The festival will have 8-9 micro breweries, wine and cider producers, and sloe gin producers; it will operate alongside the regular farmers market, which will have up to 22 food stalls.
Tiny Rebel Bo'Ho
10 hours ago