Take care, some agents doesn't do borderbounces/visa runs around Songkran, so plan well.
I had to rebook my flight (2850 baht gone) because they said in March he would have it on the 12th :(
TLDR : Answer Summary
Planning a visa run during Songkran can be challenging due to the holiday's impact on service availability. It's advised to avoid scheduling important tasks, such as border bounces or visa runs, during this time. Community members suggest checking for updates from agents and mention the potential for lost costs due to rescheduling. Additionally, it's noted that extensions should ideally be applied for 1-2 weeks before expiry to ensure time is not lost.