How would you feel if your partner goes to an event where people get drunk, naked, there's a lot of touchy-touchy and couple-like activities?

Silvercup
Hi all, yesterday my boyfriend told me that he signed up for an event and he just told me it was about being "healthy" because it consisted on running in teams, but he kept information for him like when they sent him the email where they said that at some point a competition consist of being the team wearing as least clothes/showing more skin (adding a smilie). He just told me about this when he said that there were videos about other years, and then when I saw this part of this event I was in shock.
Apart from the almost naked one (basically you see people's but, they just cover neaples and a little of their private parts with tape or a small piece of cloth), there is also massaging each other (he has not even done that to me), running hugging each other attached with tape, running with girls on your shoulders, and binge-drinking in a kind of party that takes place every hour or less in this 6 hours event.
At the beginning he said that because he is not used to running and he has many university asignments, he would just run and participate max. 1 hour, but then after the video and when I said that I didn't feel comfortable with the naked and touchy-touchy parts, he started being more deffensive and said "I won't tell you anything anymore" and that I was acting like a "taliban".
The other thing is that my birthday is approaching and he told me that I couldn't even stay for 24h at his place (with me flying from another country there) because he has so many asignments and he needs to focus, but then last month he was just partying and travelling, he keeps going to other parties and now he sings up for this 6 hours event/party (on a Thursday). I tried talking to him but he just hangs up on me and refuse to talk about it by message, and when I was trying to tell him how it would be if I signed up for something like that or a streap-pocker game or a party where people end up drunk and naked, he just ignored it.
What would you do and how would you reach to him?
Thanks!
How would you feel if your partner goes to an event where people get drunk, naked, there's a lot of touchy-touchy and couple-like activities?
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