Peter: are shops open this sunday??
Lance: i am afraid not, they are open on the next one for sure
Peter: fuck... my fridge is empty
Lance: dude it's easy to remember - first and last sunday of the month shops are open, as for the rest - they are closed
Peter: i know... i can't get used to it... shit
Lance: you can come over, i can feed you haha
Peter doesn't know when the shops are open, and when they are closed. Lance finds it easy to remember.