Even though “its” not ended, people are still going out
解除 - ended, finished, dissolved
この場合は緊事態宣言の話ですね
緊急事態宣言を解除していない - The state of national emergency has not ended
のに - though, but
みんな - everybody, everyone
出かけている - going outside, going out
Even though the state of national emergency has not ended, people are still going out
イギリス 
