be crowded with people 挤满了人；里三层，外三层；人满为患

【例句】
The train is crowded with people going home.
火车上人满为患。

Go to the fun events and social activities. It will be crowded with people. Maybe you'll make friends.
参加娱乐活动和社会活动。那里将有很多人。也许你会交上朋友。