Yes, you may change team members between regional and state competition. Furthermore, you may change team members between state and national competition.
A team who qualifies to attend the SLC or NLC may change its team members as long as at least one of the original team members still remains on the team. Advisors may register the appropriate individuals in the team event through the conference registration system by the indicated registration deadline without the need to inform the state or national office of its team member changes. After the conference registration deadline, team member substitutions will be made only for extenuating circumstances if the alternate is available for the time slot the team has been assigned. The team's scheduled time will not be changed to accommodate any substitutions.
Furthermore, if you have a student who participated on the team event, but that individual was unable to attend the regional competition, if your team qualifies for state competition the student who was unable to attend regional competition may rejoin the team. The same is true if your team advances from state to national competition. If a team member did not attend the state conference, they may rejoin the team for national competition.
Only register team members for a team event if they are able to attend the conference. If a student drops from a team event, make sure you notify the conference coordinator well in advance of the start of the team competition.
If a team ends up with only one remaining member on the team, that team will forfeit their participation in the competition.