Due to some uncontrollable circumstances, I will not be able to get in my normal weekend training

and Im looking for a way to restructur my training schedule so that I dont lose the good base ive gained and try to be able to get to race fittness without training at the weekend for a few months.
My normal training(now) is
Mon: off
Tue: fairly fast group ride 2hrs
Wed: easy recovery 1-2hrs
Thu: fairly fast group ride 2 hrs
Fri: off or easy recovery ride
Sat: 4hrs group ride, rolling terrain good pace(gradually been picking up the pace heading towards the race season)
Sun: 1+1/2 - 2hrs steady
I was thinking about maybe having something like the following.
Mon: Similar to group ride, 2hrs
Tue: recovery ride 1hr
Wed: 2hr ride, tempo,sprints etc.
Thu: endurance 3/4hrs
Fri: recover
Sat/sun off.
Wasnt too sure about doing a long endurance run after having done tempo or interval like training the day before?
Any suggestions would be great.cheers