Possible Clues:

• Party concentrated, needing a lot of workers
• Area in vibrant venue in Bristol needing many workers?
• Party as part of special event is in need of a lot of work
• Busy venue in Bristol harbours area needing many workers
• Riots, unenviable to disperse, involving a lot of workers
• Unremitting, supporting political party in need of a large workforce
• Having large staff, like busy maternity ward?
• Far too many workers at party find it extremely demanding
• Sweat — ie, invents work offering more jobs
• Involving much work