Ireland's now near the 'finishing line' of the current vaccination programme, HSE boss Paul Reid has said.
It comes as 92% of adults are now partially vaccinated, with 88% fully vaccinated.
Walk-in vaccination centres are opening again this weekend around the country, but will now also be open for those aged 12-15.
There are 19 clinics across 17 counties today, with 20 clinics across 18 counties tomorrow.
Mr Reid said: "The finishing line of this phase of the vaccination programme is so close now.
"Our focus still remains to give as many as possible protection."
It comes as a roadmap for reopening is set to be finalised by Government early next week.
The Taoiseach has said he expects to see restrictions on live entertainment, theatre and the arts eased from next month.
A return to offices is also expected to get underway from next month.
Ireland's now on track to hit 90% of adults being vaccinated by early September.
However, Michéal Martin says NPHET has been clear that they "want a two-week gap after the last second dose is administered" to ensure people have full protection.
Once the current vaccine programme concludes, focus is likely to shift to giving vulnerable groups booster vaccines during the autumn and winter.
However, some leading health experts say it's likely still too early to start a booster campaign for the general population.
The World Health Organisation has asked rich countries to hold off on booster shots until the developing countries have received more vaccines.