Parents have expressed anger over slot being refused entry to school sports days while thousands of spectators are allowed in to major sporting events.
They have called guidelines keeping parents away "ridiculous" and "unfair," pointing out the same people are at school gates daily to collect children.
One Pembrokeshire mother is planning a protest at the council over the issue.
The Welsh government said schools could let parents attend if they had the right risk assessments in place.
Charlotte Russell has two daughters, aged seven and four, at Johnston Primary in Haverfordwest, which is holding its sports day on Wednesday - her younger daughter's first one.
The 38-year-old mother of three is so incensed by the fact she will miss it, she is planning to protest outside Pembrokeshire council's offices on Tuesday.
Scenes of thousands of fans at sporting events such as the Euro 2020 championship and Wimbledon have added to her anger.
Those events are being treated as fan pilots - under the UK government's Events Research Programme - where spectators are required to show proof of vaccination or a negative test before entry.