Backwash, wake, and consequence come to mind.
I think all three basically mean the same thing. For instance:
"In the wake of the scandal, the President resigned from office."
"In the aftermath of the scandal, the President resigned from
office."
"In the backwash of the scandal, the President resigned from
office."
"As a consequence of the scandal, the President resigned from
office."
The word "aftereffect" could be used; however, it usually means that there was a delay involved in the response:
"As an aftereffect of his 1998 conviction, the felon was unable to
find a job upon his release from prison in 2017 for two years."
As for your example, these ones don't necessarily have negative connotations; they are somewhat neutral:
"Everybody is still hyped up in its wake."
"Everybody is still hyped up as a consequence of the wedding."
"Everybody is still hyped up in its backwash."
"Afterglow" could work herein as well. It has only a positive connotation:
"Everybody is still hyped up in its afterglow."