I don't believe obvious and noncontroversial material requires referencing. Though it would be preferable if it could be reference, it is not necessary. You can cite that LotN is the most popular LARP ruleset. You can cite that LotN has no-touch and no-weapon rules. However, it is not appropriate to state that most LARPs follow those rules. LotN says itself that storytellers should ignore rules if they desire and house rules are exceedingly common. You should only report what the sources state. Extrapolating claims from the sources is explicitly forbidden. If you're looking for a detailed review of the article, I would suggest filing a request for peer review and/or posting a notice at the appropriate WikiProject(s).