Someone in my Kin pointed out ......
To barter away those old Anniversary Event Tokens (i.e. Tin Token, Iron Token, Silver Token, Gold Token, etc...) for Skirmish Marks. Tad Leafcutter in Bree (the reputation guy outside the Hunting Lodge, just West of the AH).
Anniversary and metallic tokens are two different things, yes both were available during last anniversary festival, but metallic tokens make appearances during other festivals too.
As mentioned above metallic tokens can be redeemed at any time, however actual anniversary tokens you'll have to hold onto until the next anniversary.