Registered users are free to add content (events, lieux and organisation details & presentations) and in these URLs which are "linkified". Most of time these links send to event website, social network page, etc. It could be better by increasing reliability and coverage

The content added by is checked manually by moderators regularly but to improve security of visitors these added links could be checked

• collectively : set up reporting of suspicious links by other users
• automatically with a service; some solutions (apart of Google Safe Browsing) : urlscan.io, VirusTotal, PhishTank