As last year, Mass and Vespers will be open to the public during the Latin Mass Society's 'Summer School' for the training of priests in the traditional liturgy (usus antiquior).
It starts on Monday 28th July and finishes with lunch on Friday 1st August. In simple terms, there is
Mass Mon-Fri in Merton College chapel at 11.45am, and Vespers Mon-Thurs there at 6pm.
But it is worth noting the different forms of the Masses and Vespers:
Monday 28th July: Solemn High Mass 11.45; Vespers 6pm
Tuesday 29th July: Sung Mass, solemn form: 11.45; Vespers 6pm
Wednesday 30th July: Sung Mass, simple form: 11.45; Vespers 6pm
Thursday 31sr July: Solemn High Mass 11.45; Pontifical Vespers 6pm
Friday 1st July: Pontifical High Mass 11.45.