I have an Event page, to which a viewer can have many possible responses (not mutually exclusive): accept, decline, nominate someone, propose a new time line, thinking about it, email host etc.

I think putting a lot of buttons at the bottom of the page make the page very clustered. What should I do in this situation?

I am thinking of creating a left-side bar with multiple buttons. But this is a little bit unorthodox. What are my options and what would be popular solution for this situation?

Thank you.