What does the phrase “all sharing two common strands” imply?

Question

The image says:

"There are several Khasi tournaments played through the year, in all villages, all sharing two common strands - the prize goat and that all players are tribal people."

I don't quite understand the meaning of "all sharing two common strands"

The image is a part of the cover story of a national daily

Answer 1

It's a figurative use of the word strand: just like multiple (fiber) strands make up a thread, multiple strands (factors/subplots) may make up a whole (concept/plot).

"There are several Khasi tournaments played through the year, in all villages, all unified by two common factors [all sharing two common strands] - the prize goat and that all players are tribal people."

ODO:

strand[2]
NOUN
1.3 An element that forms part of a complex whole.

‘He never adequately connects the several different strands he's weaving into a cohesive whole theory.’