gavra_at_work – “”seeing as once a boy and girl have each others name and phone number, they are free to continue their relationship anywhere and anyway they chose.”
Same idea with dates from shaddchanim.”
Again, the difference being that only singles seriously intrested in getting married are going to a shadchan in the fist place, while anybody can be a wedding for any reason at all.
aposhitermaidel – I have seen my Rosh Hayeshivah attend mixed simchos as well. I do not think there is any halachic issue, only that it is asking for trouble (especially if you actually encourage boys and girls to meet, as some on this thread suggested).