Hadrisian
This could be expressed in a number of very simple ways like a ticket, acknowledgment under Temporary Fixes, or simple participation (not competition) in any event.
Um, Yumeroh already said that f2p only have to participate, not compete. Read the second point under free account from the very first post which I quote below:
Yumeroh (Aniro)
If you have a free account, you have the choice between:If your character should win a Silver Pack, it will replace the Basic Pack.
- Doing nothing: In this case, all characters of the account will be deleted.
- Involve one or more of your characters in events before the servers close: In this case, their levels will be reset and will start with a Basic Pack.
All starter packs save the toon's look and name.
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Eldest, Order of the White Lotus