I'm on summer vacations away from home, so I can't commit to schedules until I'm back in September. Also, last week's tuesday we actually had about 6/7 people ready to raid but unfortunately, everyone had logged in/out at different times (in a 1 hour span), it was just bad luck that we didn't wait 15 more minutes.
In the end, it was me Seren and Traest doing classic dungeons for the guild achievements.
Anyway, don't stress too much, we will eventually do this again in the future.