Nah, not a conference but something expressly called a banquet (‘post-conference banquet’ or something along these lines), which is why I have some difficulty reconciling it with the penitential nature of both Lent and Friday. Like I said, it’s just going to be food served in a decorated hall full of people, probably involving some alcohol and some people talking loudly, toasting each other and making jokes perhaps, from what I can expect. Nothing strictly outlawed, but not exactly the atmosphere of a penitential day, either.
I’m not from the States. In my corner of Europe dancing has traditionally always been forbidden in Lent, as in not the moves per se (e.g. not classes or competitions) but rather partying. I’d personally struggle to reconcile dancing with the penitential nature of the season anyway, as dancing is something of joy and celebration. However, our translation of the Precepts of the Church (the 4th in particular) is markedly different from the standard English version, and we operate under a primatial decree from around the time of Vatican 2, which is probably the cause of the difference. Your translation simply reaffirms the need to observe feasts and abstinence days established by the Church, ours directly bans festivities (‘loud merry-making’) in Lent. Wedding parties are not allowed, a prom would require dispensation from the local parish pastor and so on.