Answer: report -have -were-end
Step-by-step explanation:
There are 3 verbs that do not agree with their subjects in the first paragraph.
1-Organisers of the very first race reports ...Organizers is plural and requires no s in the verb. Therefore the correct is REPORT.
2-...places has now sold out...
Places is plural so the correct form is HAVE
3-...they was first released... In this sentence they is the subject o the passive voice so WERE agrees with THEY.
In the last paragraph the subject events does not agree with ends.
It should be END