okay so, this is just my experience but i hope it'll help.

1. - make sure you know that its okay to feel nervous about meeting new people, its completely normal.

  - be prepared. make sure you know what to say to them before you meet them.

  - BREATTTH and just try to be confident!

  - starts small! 1 or 3 people to start then if you feel comfortable enough try to talk to many people at once.

2. well in my opinion just ask them, but ask them politely.

"im sorry, im really bad with names, what was your name again?"

just make sure to remember their name after you ask that.

if you have a really bad stress or bad memories try to repeat their name immediately.

example :

"hello, im nana, nice to meet you"

" hey nana nice to meet you too!"

i hope this helps!