Very rare that a day's play is called off the day before, so most people turn up, try and stay under cover and get pissed.
From Lancs website:
If play is restricted or does not take place at the ground on the day for which this ticket is valid, you will be entitled to a refund of only the match ticket value subject to there being: (a) 15 overs or less because of adverse weather conditions or completion of the match - a full refund; (b) 15.1 overs to 29.5 overs because of adverse weather conditions or completion of the match - a 50% refund. In no other circumstances can money be refunded. In respect of tickets purchased in advance for the day on which this ticket is valid, refunds will be made automatically by Lancashire Cricket Club to the original purchaser only, either by refunding his or her debit or credit card or by sending a cheque. In respect of tickets purchased at the Ground on the day for which this ticket is valid, refunds may be claimed by sending this ticket with your name and address in block capitals to International Refund Application, Lancashire Cricket Club, Emirates Old Trafford, Manchester M16 0PX within 28 days of the Match date. For refund queries telephone 0161 282 4000. Also visit
www.ecb.co.uk/refundscheme. Please allow 30 days from the receipt of the claim for your refund to be processed.