Hi Ben (and all!),
Thanks for your question about the meet up time at the airport in LA. You should be at the Cathay Pacific counter no later than 7:30 pm. If you arrive in Los Angeles earlier in the day and have a big chunk of time during which you would like to explore, please feel free, but plan on giving yourself time to arrive back to the airport so that the group can meet together by 7:30 pm. Some folks have shorter layovers so may come to the counter earlier, which is also completely fine.
Have a great weekend!