Info about streaming events

• How many tickets do I need for a streaming event?
• Can I give a streaming event ticket as a present to someone?
• How and when will I receive my link and code(s) for a streaming event?
• What can I do if I haven't received the e-mail with the link and code(s) for a streaming event?
• What can I do if the link to the streaming event doesn't work?
• What can I do when my code for the streaming event doesn't work / is already used?