Even on very specialized forums and lists off topic posting is not necessarily frowned upon, but a common netiquette convention is to mark a new off-topic posting or email by beginning it with "OT" - for example in a forum discussing the Linux operating system someone might post: "OT: Wow, did you feel that earthquake?".
Posting off-topic messages to deliberately aggravate other members is a form of trolling.
... the unveiling of the festival mascot and Ambassadors in Owerri on Friday, March 7 ... These are all add-ons that has made the festival a topic in online and physical communities”, Iyaye also noted.