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# awk -F'[: ,]' '{
if(/START/){
a[$(NF-1)]=((a[$(NF-1)])?a[$(NF-1)] OFS:x)$1
}
if(/DONE/){
...

Try: awk '{a[NR]=$0}END{for (i=1;i<=NR/2;i++){print a[i+3*(int((i-1)/3))]","a[i+3*(int((i-1)/3))+3]}}' file

# ./justdoit.sh
field0,field1,field2,Foo,START,field0,field1,field2,Foo,DONE
field0,field1,field2,Foo,START,field0,field1,field2,Foo,DONE...

Try: awk '{a[(NR-1)%5]=a[(NR-1)%5]","$0}END{for (i=0;i<NR/2;i++){sub ("^,","",a[i]);print a[i]}}' file