Are event files required for MEG data?

[monique2208]

We recently found when running the bids validator that there are no warnings for missing event files with MEG data (when the task is not rest). Going over the specification it is not entirely clear to me whether they are required like they are for task fMRI. On MRI it says the following: "For task based fMRI, a corresponding task events file (see below) MUST be provided (please note that this file is not necessary for resting state scans)." But similar language is not used on the pages describing MEG or EEG data. So I am not sure if that is the case or if this is an issue in the validator.

I cannot currently share the data we validated, but I found a case on OpenNeuro where there is also no warning although the task is not rest and there are no event files: https://openneuro.org/datasets/ds004738/versions/1.0.1