So the disclaimer is that I know a lot of people just have to have the booster whenever it's available, and some people do have significant side effects.
My colleague just took an extended Christmas break (though not away on holiday), and was due to return to work today. She scheduled some quite important client meetings for today, but then she didn't come in as she had the booster yesterday and was feeling unwell. She didn't reschedule the meetings either; rather, she palmed them off on us and even obliged one colleague to run a meeting on an account he didn't know at all.
We're all feeling very indignant and believe she should have arranged her booster during the holidays or at least on a day where she wasn't working the following day (p/t worker).
Are we being unreasonable to be annoyed with her?