I was checking the Jupiter Moon Events section of Astronomy 2006 and did you know that there are 3 double shadow transits in the month of August.
Io and Europa are involved in all of them.
August 14th - egress 6.20pm and 7.10pm
" " 21st - ingress 6.24pm and 6.57pm
" " 28th - ingress 8.51pm and 9.02pm
I know it's 3 months away, but I can't wait.
Here's hoping for clear skies for at least one of those nights.