SEO for theatre niche related website

Opinions, views, suggestions, please. Theatre niche related website - ie tickets, news, reviews, interviews. For the long-running shows, there are at times `special offers`, extended booking periods etc - in as much as if making a post out of them, there isn`t exactly a lot of unique content that hasn`t been posted about the show before. So, how best to circulate this `announcement` without it causing thin content across the website? * Update show `page` with `announcement` and circulate via social media * Create a new post (thin/duplicate) and circulate etc * A `news` feed with updates (not sure how to do this) * it seems to be an opportunity to utilise the website and not just social media) * Any other suggestions? Note - it would be virtually impossible to create meaningful unique content for every new booking period. Thanks for your input :)