Not sure why this is a national holiday, I think it might be best to do it every day or as often as possible, especially in these times. That being said, I feel the best way to emulate an angel is to do the kindness in secret. Pray for an enemy, a bully, a terrible boss, etc. Leave a note of thanks or compliment or inspiration where they will find it. Remember Angels are God’s messengers, they do as God wills; so, prayers are more potent, more likely to get a positive and/or quick response when prayed in a way that benefits the person and glorifies/pleases God… not accomplish something that will make your life easier/better. Albeit God can make both happen simultaneously, but we are talking about our heart and intentions as you pray. I pray your understanding, your connection, your joy in God grows today! And dont forget to look for angel manifestations all around you.