Fantastic, a week allows you to do so much . Not knowing your ability or knowledge i'll throw some things at you,no offence meant.
Bait up several margins , trickle the bait in regularly and keep walking the lake looking for signs of feeding
Set up your base camp but in the day move around the lake fish different swims, this hopefully will keep the fish from holding up in one place
Try to get there early and talk to the previous lot on if something has worked for them it may work for you.
If every body fishes with boilies and struggles don't fish with boilies , having said that try BIG boilies 28mm or SMALL ones 8mm something different from the crowd and of course new potatoes straight from the can
no shaping them like boilies or chick peas my 2 favorites.
Pop ups and zigs different colours different depths
If you feel there are fish feeding near your rigs and you are catching nothing change your rigs, material length everything.
You are there for a week you will almost certainly catch more fish if you fish less , and by that i mean take your rods out,walk the lake with one rod if you see fish feeding drop a bait on it, if you feel a swim would be better fished with one rod then only use one rod . casting all three rod out and sitting on them for a week will be the big mistake in my opinion .
You have a whole week to outwit them dont get set in your ways, try new things until you find something that works ,
All the best ,John.