Starter theme or from scratch?

Hello! I'm looking for some recommendations.

I am building a new website for an orienteering club that I belong to. I've already built some pages out using Bootstrap and have fiddled around with converting it to Wordpress. I had to pause the project for half a year, and now that I'm getting back into it, I'm reassessing my approach and trying to choose between using a framework, parent theme, starter theme, or building from scratch.

My most important functional requirements are:

1. Publishing an event page, and pushing out key details (date, location, etc) to a table elsewhere (i.e. an event calendar)
2. Un/re-publishing those event pages once their date is past, so that they appear in "past events/results" instead of "upcoming events"
3. An advanced custom post type that allows the client to create an event page with titled blocks of information (e.g. "directions", "schedule", "course notes"), rearrange those blocks however they like, and for an anchor menu to be created out of the titles.

My assessment so far is this:

GENESIS: This seems awesome, and I've tried the course here on Treehouse, but it feels like feeling around in a black box that I can't see into. I don't think I have enough background in PHP/WP to make sense of this yet.

PARENT: My most important functionality needs aren't met by these, so it seems like I'd end up ripping a bunch out, plugging a bunch in, and ending up with a confusing mess.

STARTER: I'm seriously considering this, but I'm wondering if I will end up building my own plug-in anyway, and therefore should...

SCRATCH: ... just build from scratch. I think that the Wordpress Development course here on Treehouse will lead me through that anyway, so... why not? I am mostly intimidated by the idea of maintaining updates without breaking it. Although, if I build a complete site from scratch, that may give me the foundation I need to re-build it using Genesis.

Do you have thoughts to contribute or advice?

Thanks!