Supporters are being asked to spread the word about Charlton's #FillTheValley campaign ahead of this Saturday's clash with Plymouth Argyle by helping to get the hashtag trending on Twitter from 5pm on Monday evening.
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Season-ticket holders can claim up to three free tickets to bring friends and family along to the game in an effort to fill every seat in the house for the game against the table-topping Pilgrims and the club will be using the power of social media to spread the word with a trending attempt which will begin at 5pm.
Supporters will be encouraged to tweet as much as possible using the #FillTheValley hashtag in an attempt to get it featuring alongside the most talked about topics in the United Kingdom.
The club's trending attempts have proved successful in previous years during the #FootballForAFiver campaigns, with fans managing to get the hashtag trending in both the UK and worldwide previously.
Supporters can visit the club's official Twitter account by clicking here.