Should I wear the service uniform to a community event featuring a combat hero as the speaker?

CH (1LT) (Join to see), Sgt (Join to see) laid out the right answer.

However, from a social etiquette point of view, I would check with the event organizer to see if they have any issue (they shouldn't).

Thank you all for your inputs.
I did wear my AGSU today. I stayed in the back of the auditorium during his speech.
At the meet and greet, I got to meet him and shook his hand. He was welcoming and started to share how his chaplain ministered to him when he was dying in the field before being transported to the hospital.

CH (1LT) (Join to see) Chaplain, From AR 670-1, Page 55: When attending social functions or informal gatherings of a military character. All current and former Soldiers will conform to the wear and appearance standards in this regulation while wearing the uniform under the provisions
of this chapter.

Since this event is of a military character, wearing your uniform would be permitted.

https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN30302-AR_670-1-000-WEB-1.pdf