January 22 to January 25 - Compete against Gridcoin: vLHC 3 day Race #001
Gridcoin now organizes a challenge for vLHC@Home, formerly known as Test4Theory. Keep in mind: vLHC has only vbox apps, meaning you need to have virtualbox installed.
It seems to have been organised very well: "Erkan Yilmaz, Member of team Gridcoin: Hi, the BOINC admin asked us to cancel this challenge!"

Compete against Gridcoin: vLHC 3 day Race #001 chat and stats page