hmm ... I wrote a small test script to see if this work:

```python
from mne import fiff, Epochs, read_events
import os.path as op

base_dir = op.join(op.dirname(__file__),
                   '/home/mainakjas/github/mne-python/mne', 'fiff', 'tests',
                   'data')
raw_fname = op.join(base_dir, 'test_raw.fif')
event_name = op.join(base_dir, 'test-eve.fif')

raw = fiff.Raw(raw_fname)

event_id, tmin, tmax = 1, -0.2, 0.5
events = read_events(event_name)

picks = fiff.pick_types(raw.info, meg=True, eeg=True, stim=True,
                        ecg=True, eog=True, include=['STI 014'],
                        exclude='bads')
epochs = Epochs(raw, events, event_id, tmin, tmax, picks=picks,
                baseline=(None, 0))

grand_ev = None

for ev in epochs.iter_evoked():
    if grand_ev is None:
        grand_ev = ev
    else:
        grand_ev += ev
```

isn't this what we wanted?