皆さん、行きましょう! Minasan Ikimashou! Formal/ to people you don't know.
みな、行こう! Mina Ikou! informal/friends/ family etc.
You don't really have to do anything. Guys are pigs and will go after anything you wish to offer. Just blatantly say.. 'lets do it.'
lets go private
You say "Lets go!" in Maasai language of the African origin as "Maape!".
iff they said isshoniikimasho that means lets go together but ish means nothing
allons-y France allons-y
You may say 'yuushoku ni uchi ni kimasen ka.'
Five in Japanese is go.
"Ας πάει"
"പോവുക (pōvuka)" is how you say "let's go" in Malayalam.
"Chodźmy" is a common way to say "let's go" in Polish.
"Hup Holland" if u wana say lets go Holland in terms of the World Cup
"Let's go" in Flemish is "Laten we gaan."