Hi Jonathan,
cc mne mailing list
currently you have two options.
1/ if epochs1 and epochs2 come from 2 raw files you can create a raw
from these two with something like raw = mne.io.Raw(['file1_raw.fif',
'file2_raw.fif') or use concatenate_raws function in
mne.io.concatenate_raws. Then you'll extract the epochs from the new
raw which contains all the raw data from all files.
2/ use EpochsArray and do the concatenation of data manually.
I assume you run v0.8 or later.
Hope this helps
Alex