A: Absolutely! But your benefiting Charity does need to have set up what's called a Peer to Peer Campaign first, meaning they have created a kind of parent campaign from which you create your own personalised - or team - version of the same campaign.
If you see the big red Fundraise button on a campaign page, you're able to create your own individual or team campaign from there:
Once you've created your team event and hit Save, you'll see an option to Invite members:
Enter the email addresses of those you wish to join your team, and Invite them...they can join by clicking the email link they receive and adding the password provided to them...easy!