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It seems like you are trying to leverage a temporary event website to potentially transfer some traffic or "juice" to your main website without exposing the main site's URL. However, there are a few considerations to keep in mind:

301 Redirects:
Using a 301 redirect from event.example.com to main.com would indeed transfer some SEO value. However, as you mentioned, this would expose the main domain to users who visit the event site, defeating the purpose of keeping it undisclosed.

Canonical Tags:
Canonical tags are meant to indicate the preferred version of a page when there are duplicate or very similar content. In this case, as the event site is set to noindex, search engines may not consider canonical tags.

Noindex:
The "noindex" meta tag is used to instruct search engines not to index a particular webpage. This means the content won't appear in search engine results. However, it doesn't necessarily prevent search engines from following links on that page.

Considering the goal of transferring some SEO value without revealing the main site's URL, here are a few potential suggestions:

Link Building:
Consider building internal links on the event site to relevant pages on the main site. This won't provide an immediate SEO boost, but it may help search engines discover and index your main site's content more efficiently.

Social Media:
Promote the event site on social media platforms and encourage sharing. While this won't directly affect search engine rankings, it can generate traffic and awareness.

Email Marketing:
If you have an email list for the event, include links or CTAs (calls to action) that direct users to the main site. Again, this won't directly impact SEO but can drive targeted traffic.

The time it takes for Google to read and process a sitemap can vary. Generally, Google strives to crawl and index new content quickly, and it often depends on the size of your website, the frequency of updates, and the overall crawl budget allocated to your site.

For smaller websites with regularly updated content, Google may crawl and process the sitemap within a few hours to a day. Larger websites with extensive content might take a bit longer, ranging from a few days to a couple of weeks.

It's important to note that submitting a sitemap through Google Search Console does not guarantee an immediate crawl or indexing. Google's algorithms prioritize content based on various factors, including relevance and quality.

I hope your query was answered and if so i am glad i was off help