There is precedent for skipping some larger/major events depending on the path you take. You only get the invite if you are at the Monroe-Allegra table, thus the path with Lexi or Layla. Enzo doesn't say that it's a huge public event, to me I read it more of a BBQ they are hosting at their house for a few people. But I could be entirely wrong.
With the Iris, Erynn, and Lexi beach trip. You only get invited if you are on Lexi's route. If you are on Erynn's path you only get to hear about it from after the event as it was supposed to be a girls event. There's backstory information there, and you get to miss out on other things, such as the dirty dancing recreation even if you said you'd do it to Mel.
Then there is also Layla's hot tub party, that you only get invited to if you are on Layla's path. The one with Sienna, Sienna's boyfriend, and Elena. If you are not on Layla's path, you don't get to go, as she said it's a girls event. If you are on Lexi's, you also hear about it and she even says that Layla said it's a girls hot tub party.
So I wouldn't be surprised if some events continue to not include MC. Nyx will have to create a reason why MC can attend, likely more than one depending on what path you are taking. It's not likely a public event. Same with Lexi's costume party, I suspect it'll be a small party and you may only get to go if you are on her path.