Blind Form Submit in Email with multiple links

Hey Aubrey,
If you want your leads to see different information based on which option they pick, you can set a dynamic thank you page as described here: https://community.marketo.com/MarketoArticle?id=kA050000000LHXcCAO#dynamic-thank-you-pages. You will need to create a different Landing Page for each option they can select.

If you would like to send a different email based on which option they select, I would suggest to create a Smart Campaign as follows:
Smart List:
Fills out Form (trigger). 
Flow:
Send Email (add choices to this flow step)

In this flow step, you will have choices such as 'If 'Event Chosen' is 'Event 1', Send Email: Event 1 Email'.  'If Event Chosen is 'Event 2', Send Email: Event 2 Email'

Best,
Will

Instead of dealing with any form hassles, I would build your email as described, then setup smart campaign for each option. Create a unique link for each option (if they land at the same page, append a query string value such as www.link.com/thanks?Confirm=Option1), then build the Smart List for each link to trigger on Clicks Link in Email. Select the email, add a constraint for Link, and paste in the full URL. From there you can process these clicks with progression statuses, adding to lists, etc. 

If you want to get a little more complex, and potentially a friendlier user experience, you may want to include the option to undo their selection on the confirmation page, or switch to one of the other options.

I agree with Harrison - we used a similar technique to essentially have a survey within an email (in this case, which transportation method they were going to use) to gauge responses to an event without truly sending them to a page.