I would try to create an atmosphere where you set aside a little part of the place, some icon, some tiny thing where they can look and think for a moment and reflect on this person.
Sometimes a hug, a sigh, a look, can be enough. But they need to know its an important weekend and that this person would want them to carry on and help all the other people who will be counting on them this weekend. Try to make them honor his memory by continuing as normal, but dont alienate them. The idea of something like a ribbon or a picture and something like that can be helpful.
I was recently in a Wal-Mart and the store had lost a former employee in the Iraq war and they had a little table with the man's picture and a ribbon and this noteboard with a pen allowing people to sign and show their respect for this person.
You're welcome
I don't know how feasable this is, but maybe set aside one (small) table, and that could be "his section" for the day. You could put his picture there maybe... I don't know.
However, I like greg's ribbon idea. It gives everyone a way to show their support, while completely leaving them free to do their job at the same time.
Otherwise, I completely agree with Greg, and though I wish I had more to add, I sadly don't 
Best of luck making it thru this weekend Erica *hugs*
Amy
"Oatmeal and raisins, might as well be brown rice and broccoli. Maybe I should have a few more." ~ Tigr
By the way, I miss you too.~KB
twangdillo
*NM*