The Government has been urged to stick to its pledge to ban ticket touting amid concerns the policy will be delayed or dropped.
Frustrations have grown following complaints about resale prices for tickets to the likes of Radio 1's Big Weekend in Sunderland.
Supporters have pointed to this as a clear example of the need for stronger national action to stop fans being exploited.
The Government has pledged to ban the resale of event tickets above face value to tackle "industrial-scale" profiteering, but there are fears the move may be delayed or left out of the coming King’s Speech.
The policy follows growing frustration over events like the Big Weekend in Sunderland, where tickets appeared online at inflated prices above the two-ticket limit.
Annabella Coldrick, chief executive of the Music Managers Forum, said: "This Government needs to stand by its promises and get it done."
A host of live events, including concerts, theatre, comedy, and sport, would be protected under the proposed rules, which include capping service fees and restricting resale volumes per buyer.
Adam Webb, campaign manager at FanFair Alliance, said: "The Government has a big decision to make: will they ‘put fans first’ or not?
"Last November, ministers committed to ‘bold new measures’ to ban online ticket touting and support consumers.
"Enacting these measures should be a no-brainer but, if legislation is not presented in the upcoming King’s Speech, the cycle of industrial-scale exploitation will continue."
The Labour Party has included ticket touting reform in its election manifesto, promising to prevent consumers from being "scammed or priced out" by resellers who often use online bots to buy tickets in masse.
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Lisa Webb, consumer law expert at Which?, said: "The Government has promised to put fans first but, if this legislation is not included in the King’s Speech, the only ones celebrating will be the rip-off secondary ticketing websites and online touts."
The Government has said the plan will require new primary legislation and has pledged to introduce it "at the earliest opportunity" if it is not included in the King’s Speech.
A Government spokeswoman said: "Ticket touts are a blight on the live events industry, causing misery for millions of fans."
