I've been going to Knott End (Wed) and St Annes (Mon) bike meets, both in the Fylde area. Been up to Scotch Piper (near Ormskirk) once too which was pretty good and I'd imagine it gets very busy in the summer so no doubt there'll be more Wednesday nights out there.
Also been to the usual north west general meeting areas of Devils Bridge and Caton (near Lancaster) layby. Devils bridge is gorgeous in the summer too, nice to chill out by the river!
On the website I've got a 'meets' section which I've tried to fill up as much as I can but if anyone knows of any let me know and I can add them!