Other than the blackhole event the biggest we had was back in 5.0. PKA Vs SWP. 15 PKA and about 15 SWP. Was an incredible fight. HWS Space, SWP were baiting us into a trap and we proudly accepted. The server crashed three times, the playfield basically gave up multiple times. But nontheless it was glorious, we won the battle, i think we lost 3 CVs to SWPs 8 ships, and we destroyed many more.
Best fight ever.