In reply to mypyrex:
When I was a student on the post-grad outdoor education course at Bangor Uni, all the students were split up into groups of three and then tasked with independently planning and completing an overnight winter traverse of the Carneddau, followed by a bivi somewhere in Cwm Eigiau. All groups had to take different routes; none were allowed to be the same. The following day, all groups were to meet with the course staff at 8am in order to do a mass ascent of the Dolgarrog gorge.
All starting points for the traverse east had to be on the A5. My group decided to start from Bethesda and we were dropped off at 11pm on a Thursday night to walk up past Braich Melyn to Gerlan. We briefly met another group in Gerlan, who, like us, were intending to initially walk up Cwm Caseg before taking a different route up onto the Carneddau ridge. It was a really bright, clear, very frosty moonlit night, with a covering of fresh powder on the tops. Well ahead of us we could see the lights of another group heading up the Foel Ganol spur en route for Yr Elen.
The routes chosen by my group and our temporary companions were far less ambitious. My group was going to follow the Afon Caseg, then the Cwm Bychan valley before making a steep, direct ascent of the headwall to arrive on the ridge just west of Foel Grach. The others were going to take a broadly parallel but more direct approach to Foel Grach summit up the broad ridge to the east of Cwm Bychan. As you do, when our 2 groups parted company, we laid down a challenge as to who'd get to Foel Grach first. The race was on!
After more than a bit of a, er, struggle in Cwm Bychan (those familiar with the terrain in the cwm will nod wisely at this stage), we eventually crested the ridge at about 2am and raced on towards the summit. When we got there, there was no sign of the others. Just as we were starting to congratulate ourselves, we were hit by several snowballs. The other group had beaten us to it and had been in hiding, awaiting our arrival. All hell broke loose and we too started pelting the others with snowballs. The Yr Elen group arrived about 5-10 mins later, accompanied by another group who'd come along the ridge from Ogwen. Packs were abandoned and a massive, manic, free-for-all snowball fight ensued, accompanied by a huge amount of shouting and laughing.
After a good 10 minutes, two of the biggest piss-takers were eventually cornered outside the refuge and, to escape a barrage of snowballs, they wrenched the door open and jumped inside, followed by a hail of snowballs through the still open door.
Almost as quickly as they'd jumped in, out they came again, laughing hysterically. The refuge was occupied by two, very scared, very wide awake blokes in sleeping bags who had been expecting a quiet, mid-week winter night's bivi on the tops......
So from personal experience, I totally agree that the refuge on Foel Grach is unsuitable for overnight stops, especially if these's a heady mix of students and snow in the vicinity.
Post edited at 12:59