Over the coming Bank Holiday weekend, 22 to 25 May, there is the Crosby Music Festival in various venues in Crosby village, which is just under a mile from the Blundellsands & Crosby railway station. The venues include Stamps, the only one on the list that I can be certain serves real ale. Now in its 13th year, this festival is part of the Hope Not Hate campaign, and is free, funded by UNISON's general political fund. It's only a 25-minute train ride from Southport.
Go to Crosby Music Festival for full details of artists, venues and times.