If you're an oper on the network, you could just /(sa|svs)join* them into the channel.

Code
on *:join:#LetsChat:{
  if (o isincs $usermode) { sajoin $nick #UserHelp | sajoin $nick #Trivia }
}


*depending on the IRCd

What do you do at the end of the world? Are you busy? Will you save us?